How can I get the source code of a webpage from the code? (Similar to chrome's developer tools)

How can I get the source code of the webpage from the code? (Similar to chrome's developer tools) they want to search web content, such as capturing the source code to the memory, and then making a keyword search. However, there are a lot of Web pages that directly check the source code and have no body content. using the chrome developer tool, I found that some PHP pages actually contain content. how can I obtain these PHP pages? Then obtain the body content of these PHP pages. How can I get the source code of the webpage from the code? (Similar to chrome's developer tools)
I want to search the webpage content. for example, I want to capture the source code to the memory and then perform a keyword search.

However, there are a lot of Web pages that directly check the source code and have no body content. using the chrome developer tool, I found that some PHP pages actually contain content. how can I obtain these PHP pages? Then obtain the body content of these PHP pages.

There is no concept at all. Direction ~~ What technology is used? How is chrome implemented? Preferably the C ++ Standard

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No way for the moment, you can only right-click the source code to see
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You can only capture the final HTML source code.
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Can chrome capture the server code ??
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What do you mean by capturing php content? Impossible.

Or the final html code?
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What we caught is html, because the browser needs to present these things. of course, these things will be parsed (or pass by without any help)
You can simulate browser parsing or develop a browser plug-in... (well, I only think of this)
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Php Server source code
What security is there!
It was resolved!