Working in PHP languages with HTML is a daily task.
In the first instance I tried to combine its syntax with multi-web-mode but it consumed a lot of resources.
In the second instance I made the language reader using mmm-mode, reading php-mode in web mode.
However this has not been enough because the color problems between modes produce bugs.
Now only the web-mode for PHP works, and I have managed to activate PHP flycheck for web-mode.