php5.4以下版本json不支持不转义内容中文的解决方法

{"ordercode":"1401160935542399","creator":"u751fu6d3bu7528u54c1u6d4bu8bd5u5c0fu5c4b"}

//模拟joson中文不转义
if (version_compare(php_version, '5.4.0') >= 0) {
    function json_encode_ex($var) {
        return json_encode($var, json_unescaped_unicode);
    }
} else {
    function json_encode_ex($var) {
        if ($var === null)
            return 'null';

        if ($var === true)
            return 'true';

        if ($var === false)
            return 'false';

        static $reps = array(
            array("\", "/", "n", "t", "r", "b", "f", '"', ),
            array('\\', '\/', '\n', '\t', '\r', '\b', '\f', '"', ),
        );

        if (is_scalar($var))
            return '"' . str_replace($reps[0], $reps[1], (string) $var) . '"';

        if (!is_array($var))
            throw new exception('json encoder error!');

        $ismap = false;
        $i = 0;
        foreach (array_keys($var) as $k) {
            if (!is_int($k) || $i++ != $k) {
                $ismap = true;
                break;
            }
        }

        $s = array();

        if ($ismap) {
            foreach ($var as $k => $v)
                $s[] = '"' . $k . '":' . call_user_func(__function__, $v);

            return '{' . implode(',', $s) . '}';
        } else {
            foreach ($var as $v)
                $s[] = call_user_func(__function__, $v);

            return '[' . implode(',', $s) . ']';
        }
    }
}