- substr: documentation ( source)
- base64_decode: documentation ( source)
- base64_encode: documentation ( source)
<?php
$enc1 = base64_encode(181);
$enc2 = base64_encode('M'.$enc1.'T');
$dec1 = base64_decode($enc2);
$len = strlen($dec1);
$dec2 = substr($dec1, 1, $len-2);
$dec3 = base64_decode($dec2);
echo "\n".$dec3;