Automatic Password Generation in PHP

Sometimes you need to generate passwords for customers automatically when a new account is created. This code allows you choose the desired length and strength for the password and it is very flexible.

     <?php
    function GeneratePassword($length=8, $strength=0){
        $vowels = 'aeuy';
        $consonants = 'bdghjmnpqrstvz';
        if($strength >= 1) $consonants .= 'BDGHJLMNPQRSTVWXZ';
        if($strength >= 2) $vowels .= 'AEUY';
        if($strength >= 3) $consonants .= '12345';
        if($strength >= 4) $consonants .= '67890';
        if($strength >= 5) $vowels .= '@#$%';
     
        $password = '';
        $alt = time() % 2;
        for($i = 0; $i < $length; $i++){
            if($alt == 1){
                $password .= $consonants[(rand() % strlen($consonants))];
                $alt = 0;
            }else{
                $password .= $vowels[(rand() % strlen($vowels))];
                $alt = 1;
            }
        }
        return $password;
    }
    ?>