How does php call Css styles?

How does php call Css styles? I have been searching for a long time & nbsp; I cannot find phpcss. I shared: How does php call Css styles?
I can't find it for a long time.

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You need to understand that php only outputs a piece of text, which can be in any format (for example, common text or excel format)
When the text is in html format, it can be used as a webpage.

In other words, css only affects the webpage output by php, rather than the php program itself, and will take effect in the user's browser.
To modify the webpage style, use a statement that references the css file during php output, and then modify it in the css file.