function encrypt($data, $key) {

    $prep_code = serialize($data);

    $block = mcrypt_get_block_size('des', 'ecb');

        if (($pad = $block - (strlen($prep_code) % $block)) < $block) {

            $prep_code .= str_repeat(chr($pad), $pad);

        }

        $encrypt = mcrypt_encrypt(MCRYPT_DES, $key, $prep_code, MCRYPT_MODE_ECB);

        return base64_encode($encrypt);

    }

    function decrypt($str, $key) {

    $str = base64_decode($str);

    $str = mcrypt_decrypt(MCRYPT_DES, $key, $str, MCRYPT_MODE_ECB);

        $block = mcrypt_get_block_size('des', 'ecb');

        $pad = ord($str[($len = strlen($str)) - 1]);

        if ($pad && $pad < $block && preg_match('/' . chr($pad) . '{' . $pad . '}$/', $str)) {

            $str = substr($str, 0, strlen($str) - $pad);

        }

        return unserialize($str);

}

$key = 'okyo.cn';

$data = array('id' => 100, 'username' => 'customer', 'password' => 'e10adc3949ba59abbe56e057f20f883e');

$snarr = serialize($data);

$en = encrypt($data, $key);

$de = decrypt($en, $key);

echo "加密原型：";

print_r($data);

echo "

密钥：$key

加密结果：$en

解密结果：";

print_r($de);