- var_dump: documentation ( source)
- filter_var: documentation ( source)
<?php
$count = '1';
$count = filter_var($count, FILTER_VALIDATE_INT, ['default' => 20, 'min' => 1, 'max' => 20]);
var_dump($count);
if (!$count) {
$count = 20;
}
var_dump($count);