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@ 2014-02-04T13:25:19Z

<?php

$strValue = '-34';
if(ctype_digit((string) $strValue)){
    echo 'true' ;
} else {
    echo 'false';
}

Output
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ctype_digit: documentation ( source)

preferences:dark modelive preview

56.03 ms | 402 KiB | 5 Q