<?php
/**
 * Generates slightly more human-understandable random passwords
 *
 * @param int $len
 * @return string
 */
function makePassword($len = 8)
{
        $vowels = array('a', 'e', 'i', 'o', 'u', 'y');
        $confusing = array('I', 'l', '1', 'O', '0');
        $replacements = array('A', 'k', '3', 'U', '9');
        $choices = array(0 => rand(0, 1), 1 => rand(0, 1), 2 => rand(0, 2));
        $parts = array(0 => '', 1 => '', 2 => '');
       
        if ($choices[0]) $parts[0] = rand(1, rand(9,99));
        if ($choices[1]) $parts[2] = rand(1, rand(9,99));
       
        $len -= (strlen($parts[0]) + strlen($parts[2]));
        for ($i = 0; $i < $len; $i++)
        {
                if ($i % 2 == 0) $parts[1] .= chr(rand(97, 122));
                else $parts[1] .= $vowels[array_rand($vowels)];
        }
        if ($choices[2]) $parts[1] = ucfirst($parts[1]);
        if ($choices[2] == 2) $parts[1] = strrev($parts[1]);
       
        $r = $parts[0] . $parts[1] . $parts[2];
        $r = str_replace($confusing, $replacements, $r);
        return $r;
}

/**
 * EXAMPLE:
 */

echo makePassword(12);
?>