- substr: documentation ( source)
- microtime: documentation ( source)
- print_r: documentation ( source)
- explode: documentation ( source)
- str_pad: documentation ( source)
<?php
$nonce = explode(' ', microtime());
$request['nonce'] = $nonce[1] . str_pad(substr($nonce[0], 2, 6), 6, '0');
print_r($request['nonce']);