}_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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