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It looks a quite magic that the web-mode could mix with php mode. A major mode could contain another major mode. This seems amazing.

(add-to-list 'auto-mode-alist '("\\.php\\'" . php-mode))
(add-to-list 'auto-mode-alist '("\\.blade\\.php\\'" . web-mode))

If I have a file named "portal.blade.php", how does web-mode recognize the internal php code?

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    One question per customer . . . consider editing to frame just one (1) specific question. Consider also specifying what is meant by "recognize the internal php code" -- i.e., what is it that the original poster expects to see happen? Has the original poster tried using the library yet --- and if so, what happened and why is it now a question?
    – lawlist
    Jul 31, 2015 at 1:06

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I'm no expert in this, but taking a quick look at the code I say it's regular expressions. Web-mode seems to use regexes to search for <?|<?php tags, then it knows what comes further is php code. The same goes for html, asp, javascript and other languages. I think you should look at the code yourself (M-x describe-function web-mode). And if you're really interested, you could try writing a simple major mode to better understand how major modes work, then you should be able to know better what web-mode does under the hood.

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