使用 HTML-ENTITIES 字符集替代 mb_convert_encoding

Alternative to mb_convert_encoding with HTML-ENTITIES charset(使用 HTML-ENTITIES 字符集替代 mb_convert_encoding)

问题描述

我有以下代码:

mb_convert_encoding($string, 'HTML-ENTITIES', 'utf-8');

我需要一个完全相同但不使用任何 mb_* 函数的替代代码(mb 扩展在某些环境中不可用).

我以为

utf8_decode(htmlentities($string, ENT_COMPAT, 'utf-8'));

应该完全一样，但不幸的是它没有.

我玩了一会儿，发现这很有趣.似乎第二部分也运行htmlspecialchars".一定是 mb_convert_encoding 中的一些错误，因为 htmlentities 没有正确运行.

如果您对结果运行 htmlspecialchars_decode，您将获得与使用 mb_convert_encoding 完全相同的结果.

代码:

$string = '测试:!"$%&/()=ÖÄÜöäü<<';echo mb_convert_encoding($string, 'HTML-ENTITIES', 'utf-8')."

";echo htmlspecialchars_decode(utf8_decode(htmlentities($string, ENT_COMPAT, 'utf-8', false)));

这是上面代码的演示:http://sandbox.onlinephpfunctions.com/code/715acade3b8337d9529e4

这里有一个没有 htmlspecialchars_decode 的演示，以显示您的问题:http://sandbox.onlinephpfunctions.com/code/5c4a32bf99aa8fd6246c4a77132a023d32945363" rel="noreferrer">http://sandbox.onlinephpfunctions.com/code/5c4a32bf99aa8fd6246c4a77132A

I have the following code:

mb_convert_encoding($string, 'HTML-ENTITIES', 'utf-8');

I need to have an alternative code which does exactly the same but does not use any mb_* functions (the mb extension is not available on some environments).

I thought that

utf8_decode(htmlentities($string, ENT_COMPAT, 'utf-8'));

should do exactly the same, but unfortunately it does not.

I played around a bit, and find this very interesting. It seems like the second part also runs "htmlspecialchars". Must be some bug in mb_convert_encoding, as htmlentities is not run correctly.

If you run htmlspecialchars_decode over the result, you get exactly the same as if you would use mb_convert_encoding.

The code:

$string = 'Test:!"$%&/()=ÖÄÜöäü<<';
echo mb_convert_encoding($string, 'HTML-ENTITIES', 'utf-8')."

";
echo htmlspecialchars_decode(utf8_decode(htmlentities($string, ENT_COMPAT, 'utf-8', false)));

Here a demo of the code above: http://sandbox.onlinephpfunctions.com/code/715acade3b8337d9c9e48e58deee2a237015c259

And here a demo without htmlspecialchars_decode, to show your problem: http://sandbox.onlinephpfunctions.com/code/5c4a32bf99aa8fd6246c4a77132a023d32945363

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