gistfile1.txt

	static function generateId()
	{
		$id = str_replace('-', '', Q_Utils::uuid());
		$secret = $secret = Q_Config::get('Q', 'external', 'secret', null);
		if (isset($secret)) {
			$id = $id . md5($id . $secret);
		}
		$id = base64_encode(pack('H*', $id));
		return str_replace(array('z', '+', '/', '='), array('zz', 'za', 'zb', 'zc'), $id);
	}
	
	static function decodeId($id)
	{
		$result = '';
		$len = strlen($id);
		$escaped = false;
		$i = 0;
		$replacements = array(
			'z' => 'z',
			'a' => '+',
			'b' => '/',
			'c' => '='
		);
		while ($i < $len-1) {
			$r = $id[$i];
			$c1 = $id[$i];
			++$i;
			if ($c1 == 'z') {
				$c2 = $id[$i];
				if (isset($replacements[$c2])) {
					$r = $replacements[$c2];
					++$i;
				}
			}
			$result .= $r;
		}
		if ($i < $len) {
			$result .= $id[$i];
		}
		return $result;
	}