Garbled characters appear in the php form jump box

The php form jump box appears with garbled characters

What should I do if the JS pop-up box written in php appears with garbled characters? What's the solution?

1. First, find the encoding format in your editor. Set to utf-8 format, most encodings now use this. Of course, there are also GB2312

Here is SublimeText as an example.

2. Then, add

header("Content-Type: text/html;charset=gb2312");

or

header("Content-Type: text/html;charset=utf-8");

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