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<?php
/**
* Core Metadata API
*
* Functions for retrieving and manipulating metadata of various WordPress object types. Metadata
* for an object is a represented by a simple key-value pair. Objects may contain multiple
* metadata entries that share the same key and differ only in their value.
*
* @package WordPress
* @subpackage Meta
*/
require ABSPATH . WPINC . '/class-wp-metadata-lazyloader.php';
/**
* Adds metadata for the specified object.
*
* @since 2.9.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
* @param bool $unique Optional. Whether the specified metadata key should be unique for the object.
* If true, and the object already has a value for the specified metadata key,
* no change will be made. Default false.
* @return int|false The meta ID on success, false on failure.
*/
function add_metadata( $meta_type, $object_id, $meta_key, $meta_value, $unique = false ) {
global $wpdb;
if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) ) {
return false;
}
$object_id = absint( $object_id );
if ( ! $object_id ) {
return false;
}
$table = _get_meta_table( $meta_type );
if ( ! $table ) {
return false;
}
$meta_subtype = get_object_subtype( $meta_type, $object_id );
$column = sanitize_key( $meta_type . '_id' );
// expected_slashed ($meta_key)
$meta_key = wp_unslash( $meta_key );
$meta_value = wp_unslash( $meta_value );
$meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type, $meta_subtype );
/**
* Short-circuits adding metadata of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
* Returning a non-null value will effectively short-circuit the function.
*
* Possible hook names include:
*
* - `add_post_metadata`
* - `add_comment_metadata`
* - `add_term_metadata`
* - `add_user_metadata`
*
* @since 3.1.0
*
* @param null|bool $check Whether to allow adding metadata for the given type.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
* @param bool $unique Whether the specified meta key should be unique for the object.
*/
$check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique );
if ( null !== $check ) {
return $check;
}
if ( $unique && $wpdb->get_var(
$wpdb->prepare(
"SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d",
$meta_key,
$object_id
)
) ) {
return false;
}
$_meta_value = $meta_value;
$meta_value = maybe_serialize( $meta_value );
/**
* Fires immediately before meta of a specific type is added.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
*
* Possible hook names include:
*
* - `add_post_meta`
* - `add_comment_meta`
* - `add_term_meta`
* - `add_user_meta`
*
* @since 3.1.0
*
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $_meta_value Metadata value.
*/
do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value );
$result = $wpdb->insert(
$table,
array(
$column => $object_id,
'meta_key' => $meta_key,
'meta_value' => $meta_value,
)
);
if ( ! $result ) {
return false;
}
$mid = (int) $wpdb->insert_id;
wp_cache_delete( $object_id, $meta_type . '_meta' );
/**
* Fires immediately after meta of a specific type is added.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
*
* Possible hook names include:
*
* - `added_post_meta`
* - `added_comment_meta`
* - `added_term_meta`
* - `added_user_meta`
*
* @since 2.9.0
*
* @param int $mid The meta ID after successful update.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $_meta_value Metadata value.
*/
do_action( "added_{$meta_type}_meta", $mid, $object_id, $meta_key, $_meta_value );
return $mid;
}
/**
* Updates metadata for the specified object. If no value already exists for the specified object
* ID and metadata key, the metadata will be added.
*
* @since 2.9.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
* @param mixed $prev_value Optional. Previous value to check before updating.
* If specified, only update existing metadata entries with
* this value. Otherwise, update all entries. Default empty string.
* @return int|bool The new meta field ID if a field with the given key didn't exist
* and was therefore added, true on successful update,
* false on failure or if the value passed to the function
* is the same as the one that is already in the database.
*/
function update_metadata( $meta_type, $object_id, $meta_key, $meta_value, $prev_value = '' ) {
global $wpdb;
if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) ) {
return false;
}
$object_id = absint( $object_id );
if ( ! $object_id ) {
return false;
}
$table = _get_meta_table( $meta_type );
if ( ! $table ) {
return false;
}
$meta_subtype = get_object_subtype( $meta_type, $object_id );
$column = sanitize_key( $meta_type . '_id' );
$id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id';
// expected_slashed ($meta_key)
$raw_meta_key = $meta_key;
$meta_key = wp_unslash( $meta_key );
$passed_value = $meta_value;
$meta_value = wp_unslash( $meta_value );
$meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type, $meta_subtype );
/**
* Short-circuits updating metadata of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
* Returning a non-null value will effectively short-circuit the function.
*
* Possible hook names include:
*
* - `update_post_metadata`
* - `update_comment_metadata`
* - `update_term_metadata`
* - `update_user_metadata`
*
* @since 3.1.0
*
* @param null|bool $check Whether to allow updating metadata for the given type.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
* @param mixed $prev_value Optional. Previous value to check before updating.
* If specified, only update existing metadata entries with
* this value. Otherwise, update all entries.
*/
$check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value );
if ( null !== $check ) {
return (bool) $check;
}
// Compare existing value to new value if no prev value given and the key exists only once.
if ( empty( $prev_value ) ) {
$old_value = get_metadata_raw( $meta_type, $object_id, $meta_key );
if ( is_countable( $old_value ) && count( $old_value ) === 1 ) {
if ( $old_value[0] === $meta_value ) {
return false;
}
}
}
$meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) );
if ( empty( $meta_ids ) ) {
return add_metadata( $meta_type, $object_id, $raw_meta_key, $passed_value );
}
$_meta_value = $meta_value;
$meta_value = maybe_serialize( $meta_value );
$data = compact( 'meta_value' );
$where = array(
$column => $object_id,
'meta_key' => $meta_key,
);
if ( ! empty( $prev_value ) ) {
$prev_value = maybe_serialize( $prev_value );
$where['meta_value'] = $prev_value;
}
foreach ( $meta_ids as $meta_id ) {
/**
* Fires immediately before updating metadata of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
*
* Possible hook names include:
*
* - `update_post_meta`
* - `update_comment_meta`
* - `update_term_meta`
* - `update_user_meta`
*
* @since 2.9.0
*
* @param int $meta_id ID of the metadata entry to update.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $_meta_value Metadata value.
*/
do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );
if ( 'post' === $meta_type ) {
/**
* Fires immediately before updating a post's metadata.
*
* @since 2.9.0
*
* @param int $meta_id ID of metadata entry to update.
* @param int $object_id Post ID.
* @param string $meta_key Metadata key.
* @param mixed $meta_value Metadata value. This will be a PHP-serialized string representation of the value
* if the value is an array, an object, or itself a PHP-serialized string.
*/
do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value );
}
}
$result = $wpdb->update( $table, $data, $where );
if ( ! $result ) {
return false;
}
wp_cache_delete( $object_id, $meta_type . '_meta' );
foreach ( $meta_ids as $meta_id ) {
/**
* Fires immediately after updating metadata of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
*
* Possible hook names include:
*
* - `updated_post_meta`
* - `updated_comment_meta`
* - `updated_term_meta`
* - `updated_user_meta`
*
* @since 2.9.0
*
* @param int $meta_id ID of updated metadata entry.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $_meta_value Metadata value.
*/
do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );
if ( 'post' === $meta_type ) {
/**
* Fires immediately after updating a post's metadata.
*
* @since 2.9.0
*
* @param int $meta_id ID of updated metadata entry.
* @param int $object_id Post ID.
* @param string $meta_key Metadata key.
* @param mixed $meta_value Metadata value. This will be a PHP-serialized string representation of the value
* if the value is an array, an object, or itself a PHP-serialized string.
*/
do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value );
}
}
return true;
}
/**
* Deletes metadata for the specified object.
*
* @since 2.9.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $meta_value Optional. Metadata value. Must be serializable if non-scalar.
* If specified, only delete metadata entries with this value.
* Otherwise, delete all entries with the specified meta_key.
* Pass `null`, `false`, or an empty string to skip this check.
* (For backward compatibility, it is not possible to pass an empty string
* to delete those entries with an empty string for a value.)
* Default empty string.
* @param bool $delete_all Optional. If true, delete matching metadata entries for all objects,
* ignoring the specified object_id. Otherwise, only delete
* matching metadata entries for the specified object_id. Default false.
* @return bool True on successful delete, false on failure.
*/
function delete_metadata( $meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false ) {
global $wpdb;
if ( ! $meta_type || ! $meta_key || ! is_numeric( $object_id ) && ! $delete_all ) {
return false;
}
$object_id = absint( $object_id );
if ( ! $object_id && ! $delete_all ) {
return false;
}
$table = _get_meta_table( $meta_type );
if ( ! $table ) {
return false;
}
$type_column = sanitize_key( $meta_type . '_id' );
$id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id';
// expected_slashed ($meta_key)
$meta_key = wp_unslash( $meta_key );
$meta_value = wp_unslash( $meta_value );
/**
* Short-circuits deleting metadata of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
* Returning a non-null value will effectively short-circuit the function.
*
* Possible hook names include:
*
* - `delete_post_metadata`
* - `delete_comment_metadata`
* - `delete_term_metadata`
* - `delete_user_metadata`
*
* @since 3.1.0
*
* @param null|bool $delete Whether to allow metadata deletion of the given type.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
* @param bool $delete_all Whether to delete the matching metadata entries
* for all objects, ignoring the specified $object_id.
* Default false.
*/
$check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all );
if ( null !== $check ) {
return (bool) $check;
}
$_meta_value = $meta_value;
$meta_value = maybe_serialize( $meta_value );
$query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key );
if ( ! $delete_all ) {
$query .= $wpdb->prepare( " AND $type_column = %d", $object_id );
}
if ( '' !== $meta_value && null !== $meta_value && false !== $meta_value ) {
$query .= $wpdb->prepare( ' AND meta_value = %s', $meta_value );
}
$meta_ids = $wpdb->get_col( $query );
if ( ! count( $meta_ids ) ) {
return false;
}
if ( $delete_all ) {
if ( '' !== $meta_value && null !== $meta_value && false !== $meta_value ) {
$object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s AND meta_value = %s", $meta_key, $meta_value ) );
} else {
$object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) );
}
}
/**
* Fires immediately before deleting metadata of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
*
* Possible hook names include:
*
* - `delete_post_meta`
* - `delete_comment_meta`
* - `delete_term_meta`
* - `delete_user_meta`
*
* @since 3.1.0
*
* @param string[] $meta_ids An array of metadata entry IDs to delete.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $_meta_value Metadata value.
*/
do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value );
// Old-style action.
if ( 'post' === $meta_type ) {
/**
* Fires immediately before deleting metadata for a post.
*
* @since 2.9.0
*
* @param string[] $meta_ids An array of metadata entry IDs to delete.
*/
do_action( 'delete_postmeta', $meta_ids );
}
$query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . ' )';
$count = $wpdb->query( $query );
if ( ! $count ) {
return false;
}
if ( $delete_all ) {
$data = (array) $object_ids;
} else {
$data = array( $object_id );
}
wp_cache_delete_multiple( $data, $meta_type . '_meta' );
/**
* Fires immediately after deleting metadata of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
*
* Possible hook names include:
*
* - `deleted_post_meta`
* - `deleted_comment_meta`
* - `deleted_term_meta`
* - `deleted_user_meta`
*
* @since 2.9.0
*
* @param string[] $meta_ids An array of metadata entry IDs to delete.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param mixed $_meta_value Metadata value.
*/
do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value );
// Old-style action.
if ( 'post' === $meta_type ) {
/**
* Fires immediately after deleting metadata for a post.
*
* @since 2.9.0
*
* @param string[] $meta_ids An array of metadata entry IDs to delete.
*/
do_action( 'deleted_postmeta', $meta_ids );
}
return true;
}
/**
* Retrieves the value of a metadata field for the specified object type and ID.
*
* If the meta field exists, a single value is returned if `$single` is true,
* or an array of values if it's false.
*
* If the meta field does not exist, the result depends on get_metadata_default().
* By default, an empty string is returned if `$single` is true, or an empty array
* if it's false.
*
* @since 2.9.0
*
* @see get_metadata_raw()
* @see get_metadata_default()
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
* the specified object. Default empty string.
* @param bool $single Optional. If true, return only the first value of the specified `$meta_key`.
* This parameter has no effect if `$meta_key` is not specified. Default false.
* @return mixed An array of values if `$single` is false.
* The value of the meta field if `$single` is true.
* False for an invalid `$object_id` (non-numeric, zero, or negative value),
* or if `$meta_type` is not specified.
* An empty string if a valid but non-existing object ID is passed.
*/
function get_metadata( $meta_type, $object_id, $meta_key = '', $single = false ) {
$value = get_metadata_raw( $meta_type, $object_id, $meta_key, $single );
if ( ! is_null( $value ) ) {
return $value;
}
return get_metadata_default( $meta_type, $object_id, $meta_key, $single );
}
/**
* Retrieves raw metadata value for the specified object.
*
* @since 5.5.0
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
* the specified object. Default empty string.
* @param bool $single Optional. If true, return only the first value of the specified `$meta_key`.
* This parameter has no effect if `$meta_key` is not specified. Default false.
* @return mixed An array of values if `$single` is false.
* The value of the meta field if `$single` is true.
* False for an invalid `$object_id` (non-numeric, zero, or negative value),
* or if `$meta_type` is not specified.
* Null if the value does not exist.
*/
function get_metadata_raw( $meta_type, $object_id, $meta_key = '', $single = false ) {
if ( ! $meta_type || ! is_numeric( $object_id ) ) {
return false;
}
$object_id = absint( $object_id );
if ( ! $object_id ) {
return false;
}
/**
* Short-circuits the return value of a meta field.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
* Returning a non-null value will effectively short-circuit the function.
*
* Possible filter names include:
*
* - `get_post_metadata`
* - `get_comment_metadata`
* - `get_term_metadata`
* - `get_user_metadata`
*
* @since 3.1.0
* @since 5.5.0 Added the `$meta_type` parameter.
*
* @param mixed $value The value to return, either a single metadata value or an array
* of values depending on the value of `$single`. Default null.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param bool $single Whether to return only the first value of the specified `$meta_key`.
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
*/
$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single, $meta_type );
if ( null !== $check ) {
if ( $single && is_array( $check ) ) {
return $check[0];
} else {
return $check;
}
}
$meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' );
if ( ! $meta_cache ) {
$meta_cache = update_meta_cache( $meta_type, array( $object_id ) );
if ( isset( $meta_cache[ $object_id ] ) ) {
$meta_cache = $meta_cache[ $object_id ];
} else {
$meta_cache = null;
}
}
if ( ! $meta_key ) {
return $meta_cache;
}
if ( isset( $meta_cache[ $meta_key ] ) ) {
if ( $single ) {
return maybe_unserialize( $meta_cache[ $meta_key ][0] );
} else {
return array_map( 'maybe_unserialize', $meta_cache[ $meta_key ] );
}
}
return null;
}
/**
* Retrieves default metadata value for the specified meta key and object.
*
* By default, an empty string is returned if `$single` is true, or an empty array
* if it's false.
*
* @since 5.5.0
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param bool $single Optional. If true, return only the first value of the specified `$meta_key`.
* This parameter has no effect if `$meta_key` is not specified. Default false.
* @return mixed An array of default values if `$single` is false.
* The default value of the meta field if `$single` is true.
*/
function get_metadata_default( $meta_type, $object_id, $meta_key, $single = false ) {
if ( $single ) {
$value = '';
} else {
$value = array();
}
/**
* Filters the default metadata value for a specified meta key and object.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
*
* Possible filter names include:
*
* - `default_post_metadata`
* - `default_comment_metadata`
* - `default_term_metadata`
* - `default_user_metadata`
*
* @since 5.5.0
*
* @param mixed $value The value to return, either a single metadata value or an array
* of values depending on the value of `$single`.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param bool $single Whether to return only the first value of the specified `$meta_key`.
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
*/
$value = apply_filters( "default_{$meta_type}_metadata", $value, $object_id, $meta_key, $single, $meta_type );
if ( ! $single && ! wp_is_numeric_array( $value ) ) {
$value = array( $value );
}
return $value;
}
/**
* Determines if a meta field with the given key exists for the given object ID.
*
* @since 3.3.0
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @return bool Whether a meta field with the given key exists.
*/
function metadata_exists( $meta_type, $object_id, $meta_key ) {
if ( ! $meta_type || ! is_numeric( $object_id ) ) {
return false;
}
$object_id = absint( $object_id );
if ( ! $object_id ) {
return false;
}
/** This filter is documented in wp-includes/meta.php */
$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true, $meta_type );
if ( null !== $check ) {
return (bool) $check;
}
$meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' );
if ( ! $meta_cache ) {
$meta_cache = update_meta_cache( $meta_type, array( $object_id ) );
$meta_cache = $meta_cache[ $object_id ];
}
if ( isset( $meta_cache[ $meta_key ] ) ) {
return true;
}
return false;
}
/**
* Retrieves metadata by meta ID.
*
* @since 3.3.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $meta_id ID for a specific meta row.
* @return stdClass|false {
* Metadata object, or boolean `false` if the metadata doesn't exist.
*
* @type string $meta_key The meta key.
* @type mixed $meta_value The unserialized meta value.
* @type string $meta_id Optional. The meta ID when the meta type is any value except 'user'.
* @type string $umeta_id Optional. The meta ID when the meta type is 'user'.
* @type string $post_id Optional. The object ID when the meta type is 'post'.
* @type string $comment_id Optional. The object ID when the meta type is 'comment'.
* @type string $term_id Optional. The object ID when the meta type is 'term'.
* @type string $user_id Optional. The object ID when the meta type is 'user'.
* }
*/
function get_metadata_by_mid( $meta_type, $meta_id ) {
global $wpdb;
if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) {
return false;
}
$meta_id = (int) $meta_id;
if ( $meta_id <= 0 ) {
return false;
}
$table = _get_meta_table( $meta_type );
if ( ! $table ) {
return false;
}
/**
* Short-circuits the return value when fetching a meta field by meta ID.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
* Returning a non-null value will effectively short-circuit the function.
*
* Possible hook names include:
*
* - `get_post_metadata_by_mid`
* - `get_comment_metadata_by_mid`
* - `get_term_metadata_by_mid`
* - `get_user_metadata_by_mid`
*
* @since 5.0.0
*
* @param stdClass|null $value The value to return.
* @param int $meta_id Meta ID.
*/
$check = apply_filters( "get_{$meta_type}_metadata_by_mid", null, $meta_id );
if ( null !== $check ) {
return $check;
}
$id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id';
$meta = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table WHERE $id_column = %d", $meta_id ) );
if ( empty( $meta ) ) {
return false;
}
if ( isset( $meta->meta_value ) ) {
$meta->meta_value = maybe_unserialize( $meta->meta_value );
}
return $meta;
}
/**
* Updates metadata by meta ID.
*
* @since 3.3.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $meta_id ID for a specific meta row.
* @param string $meta_value Metadata value. Must be serializable if non-scalar.
* @param string|false $meta_key Optional. You can provide a meta key to update it. Default false.
* @return bool True on successful update, false on failure.
*/
function update_metadata_by_mid( $meta_type, $meta_id, $meta_value, $meta_key = false ) {
global $wpdb;
// Make sure everything is valid.
if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) {
return false;
}
$meta_id = (int) $meta_id;
if ( $meta_id <= 0 ) {
return false;
}
$table = _get_meta_table( $meta_type );
if ( ! $table ) {
return false;
}
$column = sanitize_key( $meta_type . '_id' );
$id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id';
/**
* Short-circuits updating metadata of a specific type by meta ID.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
* Returning a non-null value will effectively short-circuit the function.
*
* Possible hook names include:
*
* - `update_post_metadata_by_mid`
* - `update_comment_metadata_by_mid`
* - `update_term_metadata_by_mid`
* - `update_user_metadata_by_mid`
*
* @since 5.0.0
*
* @param null|bool $check Whether to allow updating metadata for the given type.
* @param int $meta_id Meta ID.
* @param mixed $meta_value Meta value. Must be serializable if non-scalar.
* @param string|false $meta_key Meta key, if provided.
*/
$check = apply_filters( "update_{$meta_type}_metadata_by_mid", null, $meta_id, $meta_value, $meta_key );
if ( null !== $check ) {
return (bool) $check;
}
// Fetch the meta and go on if it's found.
$meta = get_metadata_by_mid( $meta_type, $meta_id );
if ( $meta ) {
$original_key = $meta->meta_key;
$object_id = $meta->{$column};
/*
* If a new meta_key (last parameter) was specified, change the meta key,
* otherwise use the original key in the update statement.
*/
if ( false === $meta_key ) {
$meta_key = $original_key;
} elseif ( ! is_string( $meta_key ) ) {
return false;
}
$meta_subtype = get_object_subtype( $meta_type, $object_id );
// Sanitize the meta.
$_meta_value = $meta_value;
$meta_value = sanitize_meta( $meta_key, $meta_value, $meta_type, $meta_subtype );
$meta_value = maybe_serialize( $meta_value );
// Format the data query arguments.
$data = array(
'meta_key' => $meta_key,
'meta_value' => $meta_value,
);
// Format the where query arguments.
$where = array();
$where[ $id_column ] = $meta_id;
/** This action is documented in wp-includes/meta.php */
do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );
if ( 'post' === $meta_type ) {
/** This action is documented in wp-includes/meta.php */
do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value );
}
// Run the update query, all fields in $data are %s, $where is a %d.
$result = $wpdb->update( $table, $data, $where, '%s', '%d' );
if ( ! $result ) {
return false;
}
// Clear the caches.
wp_cache_delete( $object_id, $meta_type . '_meta' );
/** This action is documented in wp-includes/meta.php */
do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );
if ( 'post' === $meta_type ) {
/** This action is documented in wp-includes/meta.php */
do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value );
}
return true;
}
// And if the meta was not found.
return false;
}
/**
* Deletes metadata by meta ID.
*
* @since 3.3.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $meta_id ID for a specific meta row.
* @return bool True on successful delete, false on failure.
*/
function delete_metadata_by_mid( $meta_type, $meta_id ) {
global $wpdb;
// Make sure everything is valid.
if ( ! $meta_type || ! is_numeric( $meta_id ) || floor( $meta_id ) != $meta_id ) {
return false;
}
$meta_id = (int) $meta_id;
if ( $meta_id <= 0 ) {
return false;
}
$table = _get_meta_table( $meta_type );
if ( ! $table ) {
return false;
}
// Object and ID columns.
$column = sanitize_key( $meta_type . '_id' );
$id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id';
/**
* Short-circuits deleting metadata of a specific type by meta ID.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
* Returning a non-null value will effectively short-circuit the function.
*
* Possible hook names include:
*
* - `delete_post_metadata_by_mid`
* - `delete_comment_metadata_by_mid`
* - `delete_term_metadata_by_mid`
* - `delete_user_metadata_by_mid`
*
* @since 5.0.0
*
* @param null|bool $delete Whether to allow metadata deletion of the given type.
* @param int $meta_id Meta ID.
*/
$check = apply_filters( "delete_{$meta_type}_metadata_by_mid", null, $meta_id );
if ( null !== $check ) {
return (bool) $check;
}
// Fetch the meta and go on if it's found.
$meta = get_metadata_by_mid( $meta_type, $meta_id );
if ( $meta ) {
$object_id = (int) $meta->{$column};
/** This action is documented in wp-includes/meta.php */
do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value );
// Old-style action.
if ( 'post' === $meta_type || 'comment' === $meta_type ) {
/**
* Fires immediately before deleting post or comment metadata of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta
* object type (post or comment).
*
* Possible hook names include:
*
* - `delete_postmeta`
* - `delete_commentmeta`
* - `delete_termmeta`
* - `delete_usermeta`
*
* @since 3.4.0
*
* @param int $meta_id ID of the metadata entry to delete.
*/
do_action( "delete_{$meta_type}meta", $meta_id );
}
// Run the query, will return true if deleted, false otherwise.
$result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) );
// Clear the caches.
wp_cache_delete( $object_id, $meta_type . '_meta' );
/** This action is documented in wp-includes/meta.php */
do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value );
// Old-style action.
if ( 'post' === $meta_type || 'comment' === $meta_type ) {
/**
* Fires immediately after deleting post or comment metadata of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta
* object type (post or comment).
*
* Possible hook names include:
*
* - `deleted_postmeta`
* - `deleted_commentmeta`
* - `deleted_termmeta`
* - `deleted_usermeta`
*
* @since 3.4.0
*
* @param int $meta_id Deleted metadata entry ID.
*/
do_action( "deleted_{$meta_type}meta", $meta_id );
}
return $result;
}
// Meta ID was not found.
return false;
}
/**
* Updates the metadata cache for the specified objects.
*
* @since 2.9.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param string|int[] $object_ids Array or comma delimited list of object IDs to update cache for.
* @return array|false Metadata cache for the specified objects, or false on failure.
*/
function update_meta_cache( $meta_type, $object_ids ) {
global $wpdb;
if ( ! $meta_type || ! $object_ids ) {
return false;
}
$table = _get_meta_table( $meta_type );
if ( ! $table ) {
return false;
}
$column = sanitize_key( $meta_type . '_id' );
if ( ! is_array( $object_ids ) ) {
$object_ids = preg_replace( '|[^0-9,]|', '', $object_ids );
$object_ids = explode( ',', $object_ids );
}
$object_ids = array_map( 'intval', $object_ids );
/**
* Short-circuits updating the metadata cache of a specific type.
*
* The dynamic portion of the hook name, `$meta_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
* Returning a non-null value will effectively short-circuit the function.
*
* Possible hook names include:
*
* - `update_post_metadata_cache`
* - `update_comment_metadata_cache`
* - `update_term_metadata_cache`
* - `update_user_metadata_cache`
*
* @since 5.0.0
*
* @param mixed $check Whether to allow updating the meta cache of the given type.
* @param int[] $object_ids Array of object IDs to update the meta cache for.
*/
$check = apply_filters( "update_{$meta_type}_metadata_cache", null, $object_ids );
if ( null !== $check ) {
return (bool) $check;
}
$cache_key = $meta_type . '_meta';
$non_cached_ids = array();
$cache = array();
$cache_values = wp_cache_get_multiple( $object_ids, $cache_key );
foreach ( $cache_values as $id => $cached_object ) {
if ( false === $cached_object ) {
$non_cached_ids[] = $id;
} else {
$cache[ $id ] = $cached_object;
}
}
if ( empty( $non_cached_ids ) ) {
return $cache;
}
// Get meta info.
$id_list = implode( ',', $non_cached_ids );
$id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id';
$meta_list = $wpdb->get_results( "SELECT $column, meta_key, meta_value FROM $table WHERE $column IN ($id_list) ORDER BY $id_column ASC", ARRAY_A );
if ( ! empty( $meta_list ) ) {
foreach ( $meta_list as $metarow ) {
$mpid = (int) $metarow[ $column ];
$mkey = $metarow['meta_key'];
$mval = $metarow['meta_value'];
// Force subkeys to be array type.
if ( ! isset( $cache[ $mpid ] ) || ! is_array( $cache[ $mpid ] ) ) {
$cache[ $mpid ] = array();
}
if ( ! isset( $cache[ $mpid ][ $mkey ] ) || ! is_array( $cache[ $mpid ][ $mkey ] ) ) {
$cache[ $mpid ][ $mkey ] = array();
}
// Add a value to the current pid/key.
$cache[ $mpid ][ $mkey ][] = $mval;
}
}
$data = array();
foreach ( $non_cached_ids as $id ) {
if ( ! isset( $cache[ $id ] ) ) {
$cache[ $id ] = array();
}
$data[ $id ] = $cache[ $id ];
}
wp_cache_add_multiple( $data, $cache_key );
return $cache;
}
/**
* Retrieves the queue for lazy-loading metadata.
*
* @since 4.5.0
*
* @return WP_Metadata_Lazyloader Metadata lazyloader queue.
*/
function wp_metadata_lazyloader() {
static $wp_metadata_lazyloader;
if ( null === $wp_metadata_lazyloader ) {
$wp_metadata_lazyloader = new WP_Metadata_Lazyloader();
}
return $wp_metadata_lazyloader;
}
/**
* Given a meta query, generates SQL clauses to be appended to a main query.
*
* @since 3.2.0
*
* @see WP_Meta_Query
*
* @param array $meta_query A meta query.
* @param string $type Type of meta.
* @param string $primary_table Primary database table name.
* @param string $primary_id_column Primary ID column name.
* @param object $context Optional. The main query object. Default null.
* @return string[]|false {
* Array containing JOIN and WHERE SQL clauses to append to the main query,
* or false if no table exists for the requested meta type.
*
* @type string $join SQL fragment to append to the main JOIN clause.
* @type string $where SQL fragment to append to the main WHERE clause.
* }
*/
function get_meta_sql( $meta_query, $type, $primary_table, $primary_id_column, $context = null ) {
$meta_query_obj = new WP_Meta_Query( $meta_query );
return $meta_query_obj->get_sql( $type, $primary_table, $primary_id_column, $context );
}
/**
* Retrieves the name of the metadata table for the specified object type.
*
* @since 2.9.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @return string|false Metadata table name, or false if no metadata table exists
*/
function _get_meta_table( $type ) {
global $wpdb;
$table_name = $type . 'meta';
if ( empty( $wpdb->$table_name ) ) {
return false;
}
return $wpdb->$table_name;
}
/**
* Determines whether a meta key is considered protected.
*
* @since 3.1.3
*
* @param string $meta_key Metadata key.
* @param string $meta_type Optional. Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table. Default empty string.
* @return bool Whether the meta key is considered protected.
*/
function is_protected_meta( $meta_key, $meta_type = '' ) {
$sanitized_key = preg_replace( "/[^\x20-\x7E\p{L}]/", '', $meta_key );
$protected = strlen( $sanitized_key ) > 0 && ( '_' === $sanitized_key[0] );
/**
* Filters whether a meta key is considered protected.
*
* @since 3.2.0
*
* @param bool $protected Whether the key is considered protected.
* @param string $meta_key Metadata key.
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
*/
return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type );
}
/**
* Sanitizes meta value.
*
* @since 3.1.3
* @since 4.9.8 The `$object_subtype` parameter was added.
*
* @param string $meta_key Metadata key.
* @param mixed $meta_value Metadata value to sanitize.
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param string $object_subtype Optional. The subtype of the object type. Default empty string.
* @return mixed Sanitized $meta_value.
*/
function sanitize_meta( $meta_key, $meta_value, $object_type, $object_subtype = '' ) {
if ( ! empty( $object_subtype ) && has_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}" ) ) {
/**
* Filters the sanitization of a specific meta key of a specific meta type and subtype.
*
* The dynamic portions of the hook name, `$object_type`, `$meta_key`,
* and `$object_subtype`, refer to the metadata object type (comment, post, term, or user),
* the meta key value, and the object subtype respectively.
*
* @since 4.9.8
*
* @param mixed $meta_value Metadata value to sanitize.
* @param string $meta_key Metadata key.
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param string $object_subtype Object subtype.
*/
return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $meta_value, $meta_key, $object_type, $object_subtype );
}
/**
* Filters the sanitization of a specific meta key of a specific meta type.
*
* The dynamic portions of the hook name, `$meta_type`, and `$meta_key`,
* refer to the metadata object type (comment, post, term, or user) and the meta
* key value, respectively.
*
* @since 3.3.0
*
* @param mixed $meta_value Metadata value to sanitize.
* @param string $meta_key Metadata key.
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
*/
return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}", $meta_value, $meta_key, $object_type );
}
/**
* Registers a meta key.
*
* It is recommended to register meta keys for a specific combination of object type and object subtype. If passing
* an object subtype is omitted, the meta key will be registered for the entire object type, however it can be partly
* overridden in case a more specific meta key of the same name exists for the same object type and a subtype.
*
* If an object type does not support any subtypes, such as users or comments, you should commonly call this function
* without passing a subtype.
*
* @since 3.3.0
* @since 4.6.0 {@link https://core.trac.wordpress.org/ticket/35658 Modified
* to support an array of data to attach to registered meta keys}. Previous arguments for
* `$sanitize_callback` and `$auth_callback` have been folded into this array.
* @since 4.9.8 The `$object_subtype` argument was added to the arguments array.
* @since 5.3.0 Valid meta types expanded to include "array" and "object".
* @since 5.5.0 The `$default` argument was added to the arguments array.
* @since 6.4.0 The `$revisions_enabled` argument was added to the arguments array.
*
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param string $meta_key Meta key to register.
* @param array $args {
* Data used to describe the meta key when registered.
*
* @type string $object_subtype A subtype; e.g. if the object type is "post", the post type. If left empty,
* the meta key will be registered on the entire object type. Default empty.
* @type string $type The type of data associated with this meta key.
* Valid values are 'string', 'boolean', 'integer', 'number', 'array', and 'object'.
* @type string $description A description of the data attached to this meta key.
* @type bool $single Whether the meta key has one value per object, or an array of values per object.
* @type mixed $default The default value returned from get_metadata() if no value has been set yet.
* When using a non-single meta key, the default value is for the first entry.
* In other words, when calling get_metadata() with `$single` set to `false`,
* the default value given here will be wrapped in an array.
* @type callable $sanitize_callback A function or method to call when sanitizing `$meta_key` data.
* @type callable $auth_callback Optional. A function or method to call when performing edit_post_meta,
* add_post_meta, and delete_post_meta capability checks.
* @type bool|array $show_in_rest Whether data associated with this meta key can be considered public and
* should be accessible via the REST API. A custom post type must also declare
* support for custom fields for registered meta to be accessible via REST.
* When registering complex meta values this argument may optionally be an
* array with 'schema' or 'prepare_callback' keys instead of a boolean.
* @type bool $revisions_enabled Whether to enable revisions support for this meta_key. Can only be used when the
* object type is 'post'.
* }
* @param string|array $deprecated Deprecated. Use `$args` instead.
* @return bool True if the meta key was successfully registered in the global array, false if not.
* Registering a meta key with distinct sanitize and auth callbacks will fire those callbacks,
* but will not add to the global registry.
*/
function register_meta( $object_type, $meta_key, $args, $deprecated = null ) {
global $wp_meta_keys;
if ( ! is_array( $wp_meta_keys ) ) {
$wp_meta_keys = array();
}
$defaults = array(
'object_subtype' => '',
'type' => 'string',
'description' => '',
'default' => '',
'single' => false,
'sanitize_callback' => null,
'auth_callback' => null,
'show_in_rest' => false,
'revisions_enabled' => false,
);
// There used to be individual args for sanitize and auth callbacks.
$has_old_sanitize_cb = false;
$has_old_auth_cb = false;
if ( is_callable( $args ) ) {
$args = array(
'sanitize_callback' => $args,
);
$has_old_sanitize_cb = true;
} else {
$args = (array) $args;
}
if ( is_callable( $deprecated ) ) {
$args['auth_callback'] = $deprecated;
$has_old_auth_cb = true;
}
/**
* Filters the registration arguments when registering meta.
*
* @since 4.6.0
*
* @param array $args Array of meta registration arguments.
* @param array $defaults Array of default arguments.
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param string $meta_key Meta key.
*/
$args = apply_filters( 'register_meta_args', $args, $defaults, $object_type, $meta_key );
unset( $defaults['default'] );
$args = wp_parse_args( $args, $defaults );
// Require an item schema when registering array meta.
if ( false !== $args['show_in_rest'] && 'array' === $args['type'] ) {
if ( ! is_array( $args['show_in_rest'] ) || ! isset( $args['show_in_rest']['schema']['items'] ) ) {
_doing_it_wrong( __FUNCTION__, __( 'When registering an "array" meta type to show in the REST API, you must specify the schema for each array item in "show_in_rest.schema.items".' ), '5.3.0' );
return false;
}
}
$object_subtype = ! empty( $args['object_subtype'] ) ? $args['object_subtype'] : '';
if ( $args['revisions_enabled'] ) {
if ( 'post' !== $object_type ) {
_doing_it_wrong( __FUNCTION__, __( 'Meta keys cannot enable revisions support unless the object type supports revisions.' ), '6.4.0' );
return false;
} elseif ( ! empty( $object_subtype ) && ! post_type_supports( $object_subtype, 'revisions' ) ) {
_doing_it_wrong( __FUNCTION__, __( 'Meta keys cannot enable revisions support unless the object subtype supports revisions.' ), '6.4.0' );
return false;
}
}
// If `auth_callback` is not provided, fall back to `is_protected_meta()`.
if ( empty( $args['auth_callback'] ) ) {
if ( is_protected_meta( $meta_key, $object_type ) ) {
$args['auth_callback'] = '__return_false';
} else {
$args['auth_callback'] = '__return_true';
}
}
// Back-compat: old sanitize and auth callbacks are applied to all of an object type.
if ( is_callable( $args['sanitize_callback'] ) ) {
if ( ! empty( $object_subtype ) ) {
add_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'], 10, 4 );
} else {
add_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'], 10, 3 );
}
}
if ( is_callable( $args['auth_callback'] ) ) {
if ( ! empty( $object_subtype ) ) {
add_filter( "auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['auth_callback'], 10, 6 );
} else {
add_filter( "auth_{$object_type}_meta_{$meta_key}", $args['auth_callback'], 10, 6 );
}
}
if ( array_key_exists( 'default', $args ) ) {
$schema = $args;
if ( is_array( $args['show_in_rest'] ) && isset( $args['show_in_rest']['schema'] ) ) {
$schema = array_merge( $schema, $args['show_in_rest']['schema'] );
}
$check = rest_validate_value_from_schema( $args['default'], $schema );
if ( is_wp_error( $check ) ) {
_doing_it_wrong( __FUNCTION__, __( 'When registering a default meta value the data must match the type provided.' ), '5.5.0' );
return false;
}
if ( ! has_filter( "default_{$object_type}_metadata", 'filter_default_metadata' ) ) {
add_filter( "default_{$object_type}_metadata", 'filter_default_metadata', 10, 5 );
}
}
// Global registry only contains meta keys registered with the array of arguments added in 4.6.0.
if ( ! $has_old_auth_cb && ! $has_old_sanitize_cb ) {
unset( $args['object_subtype'] );
$wp_meta_keys[ $object_type ][ $object_subtype ][ $meta_key ] = $args;
return true;
}
return false;
}
/**
* Filters into default_{$object_type}_metadata and adds in default value.
*
* @since 5.5.0
*
* @param mixed $value Current value passed to filter.
* @param int $object_id ID of the object metadata is for.
* @param string $meta_key Metadata key.
* @param bool $single If true, return only the first value of the specified `$meta_key`.
* This parameter has no effect if `$meta_key` is not specified.
* @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @return mixed An array of default values if `$single` is false.
* The default value of the meta field if `$single` is true.
*/
function filter_default_metadata( $value, $object_id, $meta_key, $single, $meta_type ) {
global $wp_meta_keys;
if ( wp_installing() ) {
return $value;
}
if ( ! is_array( $wp_meta_keys ) || ! isset( $wp_meta_keys[ $meta_type ] ) ) {
return $value;
}
$defaults = array();
foreach ( $wp_meta_keys[ $meta_type ] as $sub_type => $meta_data ) {
foreach ( $meta_data as $_meta_key => $args ) {
if ( $_meta_key === $meta_key && array_key_exists( 'default', $args ) ) {
$defaults[ $sub_type ] = $args;
}
}
}
if ( ! $defaults ) {
return $value;
}
// If this meta type does not have subtypes, then the default is keyed as an empty string.
if ( isset( $defaults[''] ) ) {
$metadata = $defaults[''];
} else {
$sub_type = get_object_subtype( $meta_type, $object_id );
if ( ! isset( $defaults[ $sub_type ] ) ) {
return $value;
}
$metadata = $defaults[ $sub_type ];
}
if ( $single ) {
$value = $metadata['default'];
} else {
$value = array( $metadata['default'] );
}
return $value;
}
/**
* Checks if a meta key is registered.
*
* @since 4.6.0
* @since 4.9.8 The `$object_subtype` parameter was added.
*
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param string $meta_key Metadata key.
* @param string $object_subtype Optional. The subtype of the object type. Default empty string.
* @return bool True if the meta key is registered to the object type and, if provided,
* the object subtype. False if not.
*/
function registered_meta_key_exists( $object_type, $meta_key, $object_subtype = '' ) {
$meta_keys = get_registered_meta_keys( $object_type, $object_subtype );
return isset( $meta_keys[ $meta_key ] );
}
/**
* Unregisters a meta key from the list of registered keys.
*
* @since 4.6.0
* @since 4.9.8 The `$object_subtype` parameter was added.
*
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param string $meta_key Metadata key.
* @param string $object_subtype Optional. The subtype of the object type. Default empty string.
* @return bool True if successful. False if the meta key was not registered.
*/
function unregister_meta_key( $object_type, $meta_key, $object_subtype = '' ) {
global $wp_meta_keys;
if ( ! registered_meta_key_exists( $object_type, $meta_key, $object_subtype ) ) {
return false;
}
$args = $wp_meta_keys[ $object_type ][ $object_subtype ][ $meta_key ];
if ( isset( $args['sanitize_callback'] ) && is_callable( $args['sanitize_callback'] ) ) {
if ( ! empty( $object_subtype ) ) {
remove_filter( "sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['sanitize_callback'] );
} else {
remove_filter( "sanitize_{$object_type}_meta_{$meta_key}", $args['sanitize_callback'] );
}
}
if ( isset( $args['auth_callback'] ) && is_callable( $args['auth_callback'] ) ) {
if ( ! empty( $object_subtype ) ) {
remove_filter( "auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}", $args['auth_callback'] );
} else {
remove_filter( "auth_{$object_type}_meta_{$meta_key}", $args['auth_callback'] );
}
}
unset( $wp_meta_keys[ $object_type ][ $object_subtype ][ $meta_key ] );
// Do some clean up.
if ( empty( $wp_meta_keys[ $object_type ][ $object_subtype ] ) ) {
unset( $wp_meta_keys[ $object_type ][ $object_subtype ] );
}
if ( empty( $wp_meta_keys[ $object_type ] ) ) {
unset( $wp_meta_keys[ $object_type ] );
}
return true;
}
/**
* Retrieves a list of registered metadata args for an object type, keyed by their meta keys.
*
* @since 4.6.0
* @since 4.9.8 The `$object_subtype` parameter was added.
*
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param string $object_subtype Optional. The subtype of the object type. Default empty string.
* @return array[] List of registered metadata args, keyed by their meta keys.
*/
function get_registered_meta_keys( $object_type, $object_subtype = '' ) {
global $wp_meta_keys;
if ( ! is_array( $wp_meta_keys ) || ! isset( $wp_meta_keys[ $object_type ] ) || ! isset( $wp_meta_keys[ $object_type ][ $object_subtype ] ) ) {
return array();
}
return $wp_meta_keys[ $object_type ][ $object_subtype ];
}
/**
* Retrieves registered metadata for a specified object.
*
* The results include both meta that is registered specifically for the
* object's subtype and meta that is registered for the entire object type.
*
* @since 4.6.0
*
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $object_id ID of the object the metadata is for.
* @param string $meta_key Optional. Registered metadata key. If not specified, retrieve all registered
* metadata for the specified object.
* @return mixed A single value or array of values for a key if specified. An array of all registered keys
* and values for an object ID if not. False if a given $meta_key is not registered.
*/
function get_registered_metadata( $object_type, $object_id, $meta_key = '' ) {
$object_subtype = get_object_subtype( $object_type, $object_id );
if ( ! empty( $meta_key ) ) {
if ( ! empty( $object_subtype ) && ! registered_meta_key_exists( $object_type, $meta_key, $object_subtype ) ) {
$object_subtype = '';
}
if ( ! registered_meta_key_exists( $object_type, $meta_key, $object_subtype ) ) {
return false;
}
$meta_keys = get_registered_meta_keys( $object_type, $object_subtype );
$meta_key_data = $meta_keys[ $meta_key ];
$data = get_metadata( $object_type, $object_id, $meta_key, $meta_key_data['single'] );
return $data;
}
$data = get_metadata( $object_type, $object_id );
if ( ! $data ) {
return array();
}
$meta_keys = get_registered_meta_keys( $object_type );
if ( ! empty( $object_subtype ) ) {
$meta_keys = array_merge( $meta_keys, get_registered_meta_keys( $object_type, $object_subtype ) );
}
return array_intersect_key( $data, $meta_keys );
}
/**
* Filters out `register_meta()` args based on an allowed list.
*
* `register_meta()` args may change over time, so requiring the allowed list
* to be explicitly turned off is a warranty seal of sorts.
*
* @access private
* @since 5.5.0
*
* @param array $args Arguments from `register_meta()`.
* @param array $default_args Default arguments for `register_meta()`.
* @return array Filtered arguments.
*/
function _wp_register_meta_args_allowed_list( $args, $default_args ) {
return array_intersect_key( $args, $default_args );
}
/**
* Returns the object subtype for a given object ID of a specific type.
*
* @since 4.9.8
*
* @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user',
* or any other object type with an associated meta table.
* @param int $object_id ID of the object to retrieve its subtype.
* @return string The object subtype or an empty string if unspecified subtype.
*/
function get_object_subtype( $object_type, $object_id ) {
$object_id = (int) $object_id;
$object_subtype = '';
switch ( $object_type ) {
case 'post':
$post_type = get_post_type( $object_id );
if ( ! empty( $post_type ) ) {
$object_subtype = $post_type;
}
break;
case 'term':
$term = get_term( $object_id );
if ( ! $term instanceof WP_Term ) {
break;
}
$object_subtype = $term->taxonomy;
break;
case 'comment':
$comment = get_comment( $object_id );
if ( ! $comment ) {
break;
}
$object_subtype = 'comment';
break;
case 'user':
$user = get_user_by( 'id', $object_id );
if ( ! $user ) {
break;
}
$object_subtype = 'user';
break;
}
/**
* Filters the object subtype identifier for a non-standard object type.
*
* The dynamic portion of the hook name, `$object_type`, refers to the meta object type
* (post, comment, term, user, or any other type with an associated meta table).
*
* Possible hook names include:
*
* - `get_object_subtype_post`
* - `get_object_subtype_comment`
* - `get_object_subtype_term`
* - `get_object_subtype_user`
*
* @since 4.9.8
*
* @param string $object_subtype Empty string to override.
* @param int $object_id ID of the object to get the subtype for.
*/
return apply_filters( "get_object_subtype_{$object_type}", $object_subtype, $object_id );
}
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