<?php
function getXOR($data, $key, $string = ''){
$len = strlen($data);
$len2 = strlen($key);
for($i = 0; $i < $len; $i ++){
$j = $i % $len2;
$string .= ($data[$i]) ^ ($key[$j]);
}
return $string;
}
$data = 'this is a #test@ string';
$key = 'thisakey';
$f = getXOR($data, $key);
echo $f;
$s = getXOR($f, $key);
print_r($s);
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
