It depends what kind of empty lines they are. Single empty line inside the code (function body etc) will most likely will never be removed as it is very often used to visually separate the code a bit, but things like double empty line, or multiple empty lines between methods etc can be removed if configured to do so -- make sure that you configured it at "Settings | Code Style | PHP | Blank Lines".

Also make sure that "Settings | Code Style | PHP | Wrapping and braces | Keep when reformatting | Line breaks" is unchecked -- it may affect other settings as well.

来自 https://devnet.jetbrains.com/message/5470559
 

Is there any way to remove blank lines inside blocks and comments in PhpStorm in CSS files?

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In PhpStorm (and I suppose IntelliJ), there are quite a few options for removing blank lines in various code languages. For CSS, there is not even a tab, just an option to set "Blank lines between blocks". Is there any way to tell PhpStorm to remove blank lines inside blocks (and possibly comments) when clicking "Reformat code"? Update: Here's my settings tab:

http://stackoverflow.com/questions/26570320/is-there-any-way-to-remove-blank-lines-inside-blocks-and...