转载：PHP JSON_ENCODE 不编码中文汉字的方法

json_encode($data, JSON_UNESCAPED_UNICODE); //必须PHP5.4+

function encode_json($str) {
return urldecode(json_encode(url_encode($str)));
}

/**
*
*/
function url_encode($str) {
if(is_array($str)) {
foreach($str as $key=>$value) {
$str[urlencode($key)] = url_encode($value);
}
} else {
$str = urlencode($str);
}

return $str;
}