I do not know what happened with my PHP file in PhpStorm 2019.2.3, but it does not work with it as with php file. I mean lack of context help, code reformat etc...
Which options did I changes and how to restore it?
Actually that is problem with only 1 file, the rest are OK.

.phpfiles should probably not show a circle with a C in it as default icon either … hard to tell how they (mis-)configured their IDE here from just a screenshot that shows only the “problem”..phpfile will have normal PHP File icon (just likeartisanfile form the screenshot has).