Mine

function samp2ini($nick){
	$n = strlen($nick);
	for($i=0;$i<$n;$i++){
		switch($nick[$i]){
			case "_":
				$str .= "_00";
				break;
			case ";":
				$str .= "_01";
				break;
			case "!":
				$str .= "_02";
				break;
			case "/":
				$str .= "_04";
				break;
			case "[":
				$str .= "_05";
				break;
			case "]":
				$str .= "_06";
				break;
			case "?":
				$str .= "_07";
				break;
			case ".":
				$str .= "_08";
				break;
			case "*":
				$str .= "_09";
				break;
			case "<":
				$str .= "_10";
				break;
			case ">":
				$str .= "_11";
				break;
			case "\"":
				$str .= "_15";
				break;
			case ":":
				$str .= "_16";
				break;
			case "=":
				$str .= "_18";
				break;
			default:
				$str .= $nick[$i];
				break;
		}
	}
	return $str;
}