php json 中文不转义 & 转义为中文

JSON_UNESCAPED_UNICODE

private function decodeUnicode($str){
return preg_replace_callback('/\\\\u([0-9a-f]{4})/i',
create_function(
'$matches',
'return mb_convert_encoding(pack("H*", $matches[1]), "UTF-8", "UCS-2BE");'
),
$str);
}