- base64_decode: documentation ( source)
- preg_replace: documentation ( source)
<?php
$replacements = base64_decode('vjlSRFNWKSo6U1YkPj4MPCQAWBIZKgM4UxlWEB8qITg5Hz5qDngnAHwSZDEDc1QZXRBQKwNbUx4raQ54JwB8EmQxBHloGXsPSzEDW1QZK2QOeA4AfCxpMQR1aBl7D2kxA3RUGTBkJ3kNBnxeXDE7cmhQew9bGBx2VFAwUHFeJGNZdjEvfE9odXQtMBdTVFR0KRBuBCN8AXYYI3sdU3tQWxgpWB1TdR4RCjIBWhkQHgNSNxAkHAE=');
$randomstr = '/c175f23ad5a85d189eac918e1f6f2f8e1/';
$sql = "c175f23ad5a85d189eac918e1f6f2f8e1";
$sql = preg_replace($randomstr, $replacements, $sql, 1);
echo $sql; echo PHP_EOL;
echo chr(6);echo chr(6);echo chr(6);