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@ 2014-02-20T21:07:20Z

<?php
$n = 38;
$c = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890-_';

for ($x=0; $x<$n; $x++) {
    $c = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890';
    if (($x<$n) && ($x > 0)) { $c .= '-_'; }
	$r .= substr($c, mt_rand(0, strlen($c) - 1), 1);
}

echo $r;

Output
Performance
VLD
References
Branches

substr: documentation ( source)
mt_rand: documentation ( source)

preferences:dark modelive preview

37.17 ms | 402 KiB | 5 Q