- bin2hex: documentation ( source)
- base64_decode: documentation ( source)
- strrev: documentation ( source)
<?php
$str = 'M2ZWUHlYMmVFY01rMg==';
echo $str, "\n";
$str2 = base64_decode($str);
echo $str2, "\n";
$str3 = strrev($str2);
echo $str3, "\n";
$str4 = base64_decode($str3);
echo bin2hex($str4), "\n";
$str4 = base64_decode($str3 . '=');
echo $str4, "\n";
$str4 = base64_decode($str3 . '==');
echo $str4, "\n";