Tạo dãy chữ và số ngẫu nhiên với PHP

<?php
function randomPass($length = 6) {

     // all the chars we want to use
    $all = explode( ” ”, 
          ”a b c d e f g h i j k l m n o p q r s t u v w x y z ”
        . ”A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ”
                 . ”0 1 2 3 4 5 6 7 8 9”);

    for($i=0;$i<$length;$i++) {
        srand((double)microtime()*1000000);
        $randy = rand(0, 61);
        $pass .= $all[$randy];
    }    

    return $pass;
}
?>

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