A simple hex to RGB converterd. Based on code from http://bavotasan.com/2011/convert-hex-color-to-rgb-using-php/

gistfile1.php

<?php

//Based on http://bavotasan.com/2011/convert-hex-color-to-rgb-using-php/
class hex2rgb {

    private static $_cache = array();

    private function __construct() {        
    }

    /**
     * 
     * @param string $hex
     * @param bool $returnArray Return array and not as string
     * @param bool $arrayIndex If specified return the given index 
     * @return string|array
     */
    public static function convert($hex, $returnArray = false, $arrayIndex = null) {
        if ($hex[0] == '#') {
            $hex = substr($hex, 1);
        }
        
        $cKey = '_' . $hex;
        $rgb = array();
        
        if (!isset(self::$_cache[$cKey])) {
            if (strlen($hex) == 3) {
                $r = $hex[0] . $hex[0];
                $g = $hex[1] . $hex[1];
                $b = $hex[2] . $hex[2];
            } else {
                $r = substr($hex, 0, 2);
                $g = substr($hex, 2, 2);
                $b = substr($hex, 4);
            }

            $rgb = array(
                hexdec($r),
                hexdec($g),
                hexdec($b)
            );
            
            self::$_cache[$cKey] = $rgb;            
        }
        else {
            $rgb = self::$_cache[$cKey];
        }
        
        if ($returnArray) {
            if ($arrayIndex !== null && isset($rgb[$arrayIndex])) {
                return $rgb[$arrayIndex];
            }

            return $rgb;
        }

        return implode(',', $rgb);
    }
}