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run code in 200+ php & hhvm versions
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<?php function mt_rand_str ($l, $c = '1234567890') { for ($s = '', $cl = strlen($c)-1, $i = 0; $i < $l; $s .= $c[mt_rand(0, $cl)], ++$i); return $s; echo $s; } ?>
Output for 4.3.0 - 7.1.7