- filter_var: documentation ( source)
<?php
/*
$str = 'test1234';
preg_match_all('!\d+!', $str, $matches);*/
/*for ($matches = 0; $matches <9; $matches++)
{
$letters = range('a','j');
var_dump($letters[$matches]);
}*/
$str = 'test1234';
$int = filter_var($str, FILTER_SANITIZE_NUMBER_INT);
vqr_dump($int);