WP_Image_Editor_GD::flip( bool $horz, bool $vert ): true|WP_Error

Source

public function flip( $horz, $vert ) {
	$w   = $this->size['width'];
	$h   = $this->size['height'];
	$dst = wp_imagecreatetruecolor( $w, $h );

	if ( is_gd_image( $dst ) ) {
		$sx = $vert ? ( $w - 1 ) : 0;
		$sy = $horz ? ( $h - 1 ) : 0;
		$sw = $vert ? -$w : $w;
		$sh = $horz ? -$h : $h;

		if ( imagecopyresampled( $dst, $this->image, 0, 0, $sx, $sy, $w, $h, $sw, $sh ) ) {
			imagedestroy( $this->image );
			$this->image = $dst;
			return true;
		}
	}

	return new WP_Error( 'image_flip_error', __( 'Image flip failed.' ), $this->file );
}

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