Get random password / Keys

<?php

// Get random password
function get_random_password($chars_min=8, $chars_max=12, $use_upper_case=true, $include_numbers=true, $include_special_chars=true)
    {
        $length = rand($chars_min, $chars_max);
        $selection = 'aeuoyibcdfghjklmnpqrstvwxz';
        if($include_numbers) {
            $selection .= "1234567890";
        }
        if($include_special_chars) {
            $selection .= "!@\"#$%&[]{}?|";
        }

        $password = "";

        for($i=0; $i<$length; $i++) {
            $current_letter = $use_upper_case ? (rand(0,1) ? strtoupper($selection[(rand() % strlen($selection))]) : $selection[(rand() % strlen($selection))]) : $selection[(rand() % strlen($selection))];          
            $password .=  $current_letter;
        }              
      return $password;
    }

?>
AND CALL THIS :-
<?php
$random_key = get_random_password($chars_min=6, $chars_max=8, $use_upper_case=true, $include_numbers=true, $include_special_chars=false);

echo $random_key;
?>