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

Source

public function flip( $horz, $vert ) {
	try {
		if ( $horz ) {
			$this->image->flipImage();
		}

		if ( $vert ) {
			$this->image->flopImage();
		}

		// Normalize EXIF orientation data so that display is consistent across devices.
		if ( is_callable( array( $this->image, 'setImageOrientation' ) ) && defined( 'Imagick::ORIENTATION_TOPLEFT' ) ) {
			$this->image->setImageOrientation( Imagick::ORIENTATION_TOPLEFT );
		}
	} catch ( Exception $e ) {
		return new WP_Error( 'image_flip_error', $e->getMessage() );
	}

	return true;
}

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