- var_dump: documentation ( source)
- implode: documentation ( source)
- preg_grep: documentation ( source)
<?php
$request['typ'] = array(5,9);
$request['typ'] = preg_grep('/^[0-9]+$/', $request['typ']);
var_dump("vt.vttypid IN ('". implode("','", $request['typ']) ."')");