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@ 2014-07-07T20:18:23Z

<?php
$usernameCheck = 'dani';

function checkUsername($username) {

    return (bool)!preg_match('/[^a-z_\-0-9]/i', $username);
}

var_dump(checkUsername($usernameCheck));

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

39.36 ms | 402 KiB | 5 Q