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@ 2015-04-02T17:08:43Z

<?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
Performance
VLD
References
Branches

preg_match: documentation ( source)
range: documentation ( source)

preferences:dark modelive preview

40.85 ms | 402 KiB | 5 Q