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@ 2015-10-24T05:26:46Z

<?php

function validateMobile($mobile){
    return preg_match("/^1[345789]\d{9}$/", $mobile);
}

var_dump(validateMobile('15900000000'));
var_dump(validateMobile('13900000000'));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

52.56 ms | 402 KiB | 5 Q