/**
* Generates a random number using internal methods only.
*
* @return string
*/
public static function generateInternalRandomValue()
{
if (!self::$_randomState) {
self::$_randomState = md5(memory_get_usage() . getmypid() . serialize($_ENV) . serialize($_SERVER) . mt_rand() . microtime(), true);
}
$data = md5(uniqid(mt_rand(), true) . memory_get_usage() . microtime() . self::$_randomState, true);
self::$_randomState = substr($data, 0, 8);
return $data;
}