delete_metadata

函数
delete_metadata ( $meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false )
参数
  • (string) $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.
    Required:
  • (int) $object_id ID of the object metadata is for.
    Required:
  • (string) $meta_key Metadata key.
    Required:
  • (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.)
    Required:
    Default: (empty)
  • (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.
    Required:
    Default: false
返回值
  • (bool) True on successful delete, false on failure.
定义位置
相关方法
delete_metaget_metadatadelete_metadata_by_midupdate_metadataadd_metadata
引入
2.9.0
弃用
-

delete_metadata: 这个函数删除一个特定对象(文章、用户、评论等)的元字段。

删除指定对象的元数据。

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;
}

常见问题

FAQs
查看更多 >