您可以在任何编码中使用任何HTML 实体"，并且在实践中，如果您安装了合适的字体，则每个浏览器都可以正常工作.好吧，它是为显示当前编码中未包含的字符而创建的.在你的情况下，你必须在你的 Windows 机器上安装一些字体.

You can use any "HTML Entity" in any encoding and in practice, if You have installed appropriate fonts, every browser will work fine. Well, it was created for displaying characters that are not included in current encoding. In Your situations it looks You have to install some fonts on Your Windows box.

另一方面，它几乎与 PHP 无关.

On the other hand, it has almost nothing to do with PHP.