- substr: documentation ( source)
- var_dump: documentation ( source)
- is_numeric: documentation ( source)
- sha1: documentation ( source)
- preg_match: documentation ( source)
<?php
$s = "1$";
$cc = 1337;
$bb=42;
$k2 = "00000000000000000000000000000000000{$cc}$";
var_dump(strlen($k2) == $bb);
var_dump(preg_match('/^\d+$/', $k2));
var_dump(!is_numeric($k2));
var_dump($k2 == $cc);
$cc = '11111111111111111111111111';
var_dump(substr($cc, $bb));
var_dump(sha1($cc));
var_dump(sha1(1337));
$a = 1;