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@ 2012-12-19T18:31:10Z

<?php

$str1 = "3543900000133243";
$str2 = "354334494923243";
$str3 = "154334494923243";


echo preg_match("/\A3543/",$str1,$res);
var_dump($res);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

40.28 ms | 402 KiB | 5 Q