/**

	 * 中文转换为JSON字符串

	 * @param $chinese_str 中文：可以包含中文字母数字

	 * @return string

	 */

	function json_encode($chinese_str)

	{

		$chinese_str = iconv('UTF-8', 'UCS-2', $chinese_str);

		$len = strlen($chinese_str) - 1;

		$str = '';

		for ($i = 0; $i < $len; $i = $i + 2)

		{

			$c1 = $chinese_str[$i];

			$c2 = $chinese_str[$i + 1];

			$unicode1=ord($c1);

			$unicode2=ord($c2);

			if ($unicode1)

			{    // 两个字节的文字

				$unicode1='\u'.base_convert($unicode1, 10, 16);

				$unicode2=base_convert($unicode2, 10, 16);

				if(in_array($unicode2,array('a','b','c','d','e','f'))){

					$unicode2='0'.$unicode2;

				}

				$str.=$unicode1.$unicode2;

			}else{

				$str.=$c2;

			}

		}

		return $str;

	}

	/**

	 * JSON字符串转换为中文

	 * @param $json_str JSON字符串

	 * @return string

	 */

	function json_decode($json_str)

	{

		// 转换编码，将JSON字符串转换成可以浏览的utf-8编码

		$pattern = '/([\w]+)|(\\\u([\w]{4}))/i';

		preg_match_all($pattern, $json_str, $matches);

		$chinese_str = '';

		if (!empty($matches))

		{

			$count=count($matches[0]);

			for ($j = 0; $j < $count; $j++)

			{

				$str = $matches[0][$j];

				if (strpos($str, '\\u') === 0)

				{

					$code = base_convert(substr($str, 2, 2), 16, 10);

					$code2 = base_convert(substr($str, 4), 16, 10);

					$c = chr($code).chr($code2);

					$c = iconv('UCS-2', 'UTF-8', $c);

					$chinese_str .= $c;

				}

				else

				{

					$chinese_str .= $str;

				}

			}

		}

		return $chinese_str;

	}