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<?php function randomString($length = 6) { $str = ""; $characters = array_merge(range('a','z'), range('0','9')); $max = count($characters) - 1; for ($i = 0; $i < $length; $i++) { $rand = mt_rand(0, $max); $str .= $characters[$rand]; } return $str . time(); } echo randomString();

preferences:
34.73 ms | 402 KiB | 5 Q