// Configuration definitions, move to config.php
$CONFIG['security']['password_generator'] = array(
        "C" => array('characters' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 'minimum' => 4, 'maximum' => 6),
        "S" => array('characters' => "!@()-_=+?*^&", 'minimum' => 1, 'maximum' => 2),
        "N" => array('characters' => '1234567890', 'minimum' => 2, 'maximum' => 2)
);

function STEM_GeneratePassword()
{
        // Create the meta-password
        $sMetaPassword = "";
       
        global $CONFIG;
        $ahPasswordGenerator = $CONFIG['security']['password_generator'];
        foreach ($ahPasswordGenerator as $cToken => $ahPasswordSeed)
                $sMetaPassword .= str_repeat($cToken, rand($ahPasswordSeed['minimum'], $ahPasswordSeed['maximum']));
               
        $sMetaPassword = str_shuffle($sMetaPassword);
       
        // Create the real password
        $arBuffer = array();
        for ($i = 0; $i < strlen($sMetaPassword); $i ++)
                $arBuffer[] = $ahPasswordGenerator[(string)$sMetaPassword[$i]]['characters'][rand(0, strlen($ahPasswordGenerator[$sMetaPassword[$i]]['characters']) - 1)];

        return implode("", $arBuffer);
}