decode HeidiSQL password in php

heidisql_pass.php

<?php
// ported from http://sourceforge.net/p/heidisql/code/HEAD/tree/trunk/source/helpers.pas#l462
function heidisql_decrypt($str){ 
	$j = $salt = $nr = 0;
	$result = '';
	if ($str == '') {
		return ;
	}
 	$j = 0;
  $salt = intval($str[strlen($str)-1]);
	while($j < strlen($str)-1){
		$nr = hexdec($str[$j] . $str[$j+1]) - $salt;
		if ($nr < 0) {
			$nr += 255;
		}
		$result .= chr($nr);
		$j += 2;
	}
	return $result;
}