对于安全性要求不高的情况下足够用了，性能从高到低的两种实现：
<?php
function xor_enc($string, $operation, $key = 'abcdf') {
$string = $operation == 'ENCODE' ? $string : base64_decode($string);
$len1 = strlen($string);
$len2 = strlen($key);
if($len1 > $len2) $key = str_repeat($key, ceil($len1 / $len2));
$string = $operation == 'ENCODE' ? base64_encode($string ^ $key) : $string ^ $key;
return $string;
}
?> function xor_enc($string, $operation = 'ENCODE', $key = 'abcd') {
$txt = $operation == 'ENCODE' ? $string : base64_decode($string);
$len = strlen($key);
$code = '';
for ($i = 0; $i < strlen($string); $i ++) {
$k = $i % $len;
$code .= $string [$i] ^ $key [$k];
}
$code = $operation == 'ENCODE' ? base64_encode($code) : $code;
return $code;
}标签：none