How to solve garbled php files

How to solve the garbled php file? The specific method is as follows:

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1. Check whether the encoding format of the project is UTF-8.

2. Add the following code at the beginning of the page:

<?php
header("content-type:text/html;charset=utf-8");  //设置编码
?>

3. If it is a PHP file that mixes HTML and PHP languages, you also need tag, add the following code:

<meta charset="UTF-8">

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