function my_json_encode($arr){
//convmap since x char codes so it takes all multibyte codes (above ASCII ). So such characters are being "hidden" from normal json_encoding
array_walk_recursive($arr, function (&$item, $key) { if (is_string($item)) $item = mb_encode_numericentity($item, array (x, xffff, , xffff), 'UTF-'); });
return mb_decode_numericentity(json_encode($arr), array (x, xffff, , xffff), 'UTF-');
}

<?php
echo json_encode("中文", JSON_UNESCAPED_UNICODE);
//"中文"

$array = array(
'test'=>urlencode("我是测试")
);
$array = json_encode($array);
echo urldecode($array);
//{"test":"我是测试"}

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);
}