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@ 2018-08-29T14:50:54Z

<?php

$b = preg_match('/\D/', '768486') !== 1;
var_dump($b);

$b = preg_match('/\D/', '768d486') !== 1;
var_dump($b);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive previewkey bindings

114.04 ms | 1972 KiB | 5 Q