- var_dump: documentation ( source)
- is_numeric: documentation ( source)
- filter_var: documentation ( source)
<?php
$varToFilter = "2555tadshasgdsdg";
//$test = filter_var($varToFilter, FILTER_SANITIZE_STRING);
$test = filter_var($varToFilter, FILTER_SANITIZE_NUMBER_INT);
var_dump($test);
var_dump(is_numeric('222ttt'));