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@ 2014-02-05T18:03:57Z

<?php
foreach(range(-1000 , 1000)as $num){
    if(ctype_digit($num)){
        echo $num . ", ";
    }    
}

Output
Performance
VLD
References
Branches

ctype_digit: documentation ( source)
range: documentation ( source)

preferences:dark modelive preview

32.83 ms | 402 KiB | 5 Q