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@ 2015-06-17T10:02:56Z

<?php
$num="10";
if(strlen($num)<4){
    $num=str_pad($num,4,"0",STR_PAD_LEFT);
}
echo $num;

Output
Performance
VLD
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str_pad: documentation ( source)

preferences:dark modelive preview

48.89 ms | 402 KiB | 5 Q