_WP_Dependency example

    public function add( $handle, $src, $deps = array(), $ver = false, $args = null ) {
        if ( isset( $this->registered[ $handle ] ) ) {
            return false;
        }
        $this->registered[ $handle ] = new _WP_Dependency( $handle, $src, $deps, $ver, $args );

        // If the item was enqueued before the details were registered, enqueue it now.         if ( array_key_exists( $handle, $this->queued_before_register ) ) {
            if ( ! is_null( $this->queued_before_register[ $handle ] ) ) {
                $this->enqueue( $handle . '?' . $this->queued_before_register[ $handle ] );
            } else {
                $this->enqueue( $handle );
            }

            unset( $this->queued_before_register[ $handle ] );
        }