<?php function is_intstr($val, $negative=false) { return preg_match("/^".($negative?"-?":"")."(0|[1-9][0-9]*)$/", $val); } foreach(range(-10, 20) as $n) { echo $n*$n*$n; echo " - "; echo is_intstr($n*$n*$n, true); echo "\n"; }
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