How to dynamically modify the title of a web page in php

How to dynamically modify the title of a web page in php: first create a variable "$page_title"; then set the code in the corresponding php script file to "echo("") ;" That's it.

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Specific questions:

I can call my title on every page.

This means on every page I have the same title (bad for SEO)

Is there a workaround Is it possible to set the page title outside of header.php?

Solution:

Create a variable $page_title. Set it before including the title, and set it in the title as follows:

echo("<title>$page_title</title>");

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