src/DdvRestfulApi/Lib/RestfulApiEcho.php
public static function toJsonString($data, $isNotUnescapedUnicode = true)
    {
        if ($isNotUnescapedUnicode !== true) {
            $r = json_encode($data);
        } else {
            if (version_compare(PHP_VERSION, '5.4.0', '<')) {
                $r = json_encode($data);
                $r = preg_replace_callback(
                    "#\\\u([0-9a-f]{4})#i",
                    function ($matchs) {
                        return iconv('UCS-2BE', 'UTF-8', pack('H4', $matchs[1]));
                    },
                    $r
                );
            } else {
                $r = json_encode($data, JSON_UNESCAPED_UNICODE);
            }
        }
        return $r;
    }
public static function toJsonString($data, $isNotUnescapedUnicode = true)
    {
        if ($isNotUnescapedUnicode !== true) {
            $r = json_encode($data);
        } else {
            if (version_compare(PHP_VERSION, '5.4.0', '<')) {
                $r = json_encode($data);
                $r = preg_replace_callback(
                    "#\\\u([0-9a-f]{4})#i",
                    function ($matchs) {
                        return iconv('UCS-2BE', 'UTF-8', pack('H4', $matchs[1]));
                    },
                    $r
                );
            } else {
                $r = json_encode($data, JSON_UNESCAPED_UNICODE);
            }
        }
        return $r;
    }
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