WP_Image_Editor_GD::rotate( float $angle )

	public function rotate( $angle ) {
		if ( function_exists('imagerotate') ) {
			$transparency = imagecolorallocatealpha( $this->image, 255, 255, 255, 127 );
			$rotated = imagerotate( $this->image, $angle, $transparency );

			if ( is_resource( $rotated ) ) {
				imagealphablending( $rotated, true );
				imagesavealpha( $rotated, true );
				imagedestroy( $this->image );
				$this->image = $rotated;
				$this->update_size();
				return true;
			}
		}
		return new WP_Error( 'image_rotate_error', __('Image rotate failed.'), $this->file );
	}