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<?php function is_intstr($val, $negative=false) { return preg_match("/^".($negative?"-?":"")."(0|[1-9][0-9])*$/", $val); } foreach(range(0, 10) as $n) { echo $n; echo " - "; echo is_intstr($n); echo "\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
0 - 1 1 - 0 2 - 0 3 - 0 4 - 0 5 - 0 6 - 0 7 - 0 8 - 0 9 - 0 10 - 1

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