- preg_match: documentation ( source)
- range: documentation ( source)
<?php
function is_intstr($val) {
return preg_match("/^(0|[1-9][0-9]*)$/", $val);
}
foreach(range(0, 100) as $n) {
echo $n*$n;
echo " - ";
echo is_intstr($n*$n);
echo "\n";
}