Password generator method

passwordGenerator.php

<?php

/**
 * Generate Password with a given length and strength
 *
 * @param int $length
 * @param int $strength
 * @return string
 */
function generatePassword($length = 9, $strength = 4)
{
    $vowels     = 'aeiouy';
    $consonants = 'bcdfghjklmnpqrstvwxz';
    
    if ($strength >= 1)
        {
            $consonants .= 'BCDFGHJKLMNPQRSTVWXZ';
        }

        if ($strength >= 2)
        {
            $vowels .= "AEIOUY";
        }

        if ($strength >= 4)
        {
            $consonants .= '23456789';
        }

        if ($strength >= 8)
        {
            $consonants .= '@#$%';
        }

    $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;
}