PHP Convert Hex to RGB

<?php 
/**
	* Converts a hex code to the rgb value
	*
	* @param hex                    hex code with or without the # symbol
	* @return string
	*/
	hex2rgb($hex) {
	   $hex = str_replace("#", "", $hex);

	   if(strlen($hex) == 3) {
	      $r = hexdec(substr($hex,0,1).substr($hex,0,1));
	      $g = hexdec(substr($hex,1,1).substr($hex,1,1));
	      $b = hexdec(substr($hex,2,1).substr($hex,2,1));
	   } else {
	      $r = hexdec(substr($hex,0,2));
	      $g = hexdec(substr($hex,2,2));
	      $b = hexdec(substr($hex,4,2));
	   }
	   $rgb = array($r, $g, $b);
	   return implode(",", $rgb); // returns the rgb values separated by commas
	   //return $rgb; // returns an array with the rgb values
	}
?>