What should I do if echo does not come out in php?

How to avoid echo in php:

If you want to mix php in HTML code, you need to use .php as the file extension name,

Another way to access the modified file is: enter localhost/file name (the file address in the root directory of the website, including the extension) in the browser;

You can also double-click the html file Open, but this way the php code cannot be executed.

Recommended tutorial: "php tutorial"

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