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@ 2016-11-10T18:02:09Z

<?php

for ($i = 0; $i < 255; $i++) {
    ctype_digit($i);
    echo "$i:$result\n";
}

Output
Performance
VLD
References
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ctype_digit: documentation ( source)

preferences:dark modelive preview

53.24 ms | 402 KiB | 5 Q