maybe_serialize

maybe_serialize函数是用来在WordPress中序列化数据的。如果数据已经被序列化了，该函数会原样返回。否则，它将使用PHP的序列化函数来序列化数据。

如果需要的话，将数据序列化。
”

function maybe_serialize( $data ) {
	if ( is_array( $data ) || is_object( $data ) ) {
		return serialize( $data );
	}

	/*
	 * Double serialization is required for backward compatibility.
	 * See https://core.trac.wordpress.org/ticket/12930
	 * Also the world will end. See WP 3.6.1.
	 */
	if ( is_serialized( $data, false ) ) {
		return serialize( $data );
	}

	return $data;
}