- substr: documentation ( source)
- base64_decode: documentation ( source)
- array_rand: documentation ( source)
- base64_encode: documentation ( source)
- str_split: 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;
$f = $enc[array_rand(str_split($enc1))];
$s = $enc[array_rand(str_split($enc1))];
echo $f.'='.$s;