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@ 2013-08-12T17:50:59Z

<?php

for ($i = 0; $i < 500; $i++) {
    echo "$i => " . (ctype_digit($i) ? "Y" : "N") . "\n";
}

Output
Performance
VLD
References
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ctype_digit: documentation ( source)

preferences:dark modelive preview

42.7 ms | 402 KiB | 5 Q