Solution to the Chinese problem when systemvolumeinformation PHP processes json

The operation code is as follows:

Copy the code The code is as follows:

$usr = new User();
echo json_encode($usr);
?>

It’s very simple Code, everything is normal without Chinese, the output is as follows:
{"PlatformID":"123213","UserID":"1023"}
Once there is Chinese, two situations will occur.
The first case is that a certain value of the object itself is Chinese and the attribute is UTF-8 encoded, then there will be the following output:
{"PlatformID":"123213","UserID":"1023","UserName": "u00b7u00f0u00b5u00b2u00c9u00b1u00b7u00f0u00ccu00fc"}
The UserName is in non-human language. This is normal. If we use firebug to see it, it is in Chinese. (I struggled with this for a long time)
The second case is non-utf-8 encoding, the output will become null:
{"PlatformID":"123213","UserID":"1023","UserName":null}
Very Strange, after checking the manual, I found that json_encode is only valid for utf-8, and other encodings will become null.
Let’s start to solve the problem of encoding conversion.
See other people’s functions on php.net as follows:

Copy the code The code is as follows:

private function to_utf8($in)
{
if (is_array($in)) {
foreach ($ in as $key => $value)
{
$out[$this->to_utf8($key)] = $this->to_utf8($value);
}
}
elseif(is_string($in ))
{
if(mb_detect_encoding($in) != "UTF-8")
return utf8_encode($in);
else
return $in;
}
else
{
return $in;
}
return $out;
}

So I took it out and converted the encoding and found that it was no longer null. I was delighted to open it with firebug and found that it was not my original Chinese characters....I started to wonder...
Is it necessary? Let him convert it to the original encoding? Go back and find the original encoding...
The test begins:
1. Output $usr->UserName directly, and set charset=utf-8 in the page header. Garbled code
2.echo json_encode($usr) outputs UserName=null
3. The page header is set to charset=gbk, and the output is correct -> It can be determined that the original encoding is gbk
Finally, the conclusion is drawn through IE, Chrome, and Firefox tests:
1. Ensure that the page character set is consistent with the database, and the output must be normal.
2. When doing json_encode, ensure that the data encoding is utf-8 and json_decode is normal.
3. If you want to json_encode non-utf-8 characters, convert them to utf-8 first.
4. When doing json_decode on non-utf-8 characters, you must not forget to convert to the original encoding, otherwise garbled characters will be output!!
The problem that has been bothering me for a day is finally solved.

The above introduces the solution to the Chinese problem when systemvolumeinformation PHP processes json, including the content of systemvolumeinformation. I hope it will be helpful to friends who are interested in PHP tutorials.