- var_dump: documentation ( source)
- ctype_digit: documentation ( source)
<?php
$refundDelays = ['66', 66, '0', 0, '', null, false, 'caca maca', ' ', '1.e2'];
foreach($refundDelays as $value) {
$b = ctype_digit($value);
$c = is_int($value) || ctype_digit($value);
var_dump($value);
var_dump($b);
var_dump($c);
}