<?php 
// Hex to RGB conversion
function 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);
}

// Example usage
$color = '#000000';
$output = hex2rgb($color);
echo 'rgb('.$output.')';
// This will output rgb(0,0,0)