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@ 2017-08-21T01:05:48Z

<?php
$nik=1234567891234567;

var_dump($nik);

if(preg_match('/^[1-9]\d{15}$/', $nik)){
    echo "Contains only numbers";
    exit;
}else{
    echo "Contains non-numeric characters";
    exit;
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

28.31 ms | 405 KiB | 5 Q