Draw text to existing image and save it into new one - PHP

gistfile1.txt

    		$ts = gmdate("D, d M Y H:i:s") . " GMT";
		header("Expires: $ts");
		header("Last-Modified: $ts");
		header("Pragma: no-cache");
		header("Cache-Control: no-cache, must-revalidate");
		
		$imgPath = \URL::to( 'exiting_images/exiting.jpg' );
		$save_image = 'user_images/test.jpg';
		$save_to = public_path($save_image);
		
		$image = imagecreatefromjpeg($imgPath);
		$color = imagecolorallocate($image, 247, 178, 84);

		list($width, $height) = getimagesize($imgPath);
		
		$font_file = public_path('fonts/nautilus-webfont.ttf');

		$font_width = ImageFontWidth(23);
		$font_height = ImageFontHeight(23);

		$text_width = $font_width * strlen($user_name);

		$position_center = ceil(($width - $text_width) / 2) - 40;
		
		imagefttext($image, 23, 0, $position_center, 140, $color, $font_file, $user_name);
		imagejpeg($image, $save_to);
		imagedestroy( $image );