Question

When I close a file in PhpStorm, it saves the file automatically.
How can I change it to ask me “Do you want do save the file before closing?”

Answer 1

There is no way to disable automatic save completely, but you can partially control this behavior:

Note that those are optional autosave triggers, and you cannot turn off autosave completely.

The answer below from @Owen is not correct, since there is no way to completely turn off automatic save in the IDE.

Automatic save is the core design feature, we believe that it’s much more efficient and productive than manual save. There is no way to disable this behavior or enable any confirmations, quoting the FAQ (WebStorm is based on IntelliJ IDEA platform, so the same applies):

Because IntelliJ IDEA has the ability to change so many files
simultaneously in large refactoring actions, and change them without
ever opening them, single file saves don’t make very much sense. In
recognition of this, IntelliJ IDEA reserves the right to save any
of your files literally whenever it wishes. It’s actually quite nice
to never have to worry about your file’s save statuses, once you get
used to it.

"What if I don’t like some changes I made, and want to
roll them back?", I hear you say. Well, for that IntelliJ IDEA
includes this amazing feature called the Local History.
Every time it saves your files, IntelliJ IDEA actually saves a diff of
your file from it’s previous state, and saves that as well. You can
see the entire edit history of your files (going back some
configurable number of days), see the changes you’ve made, and roll
back any change. It rules triumphantly, and more than makes up for the
temporary disorientation caused by lack of single-file save.

This feature has been in IntelliJ IDEA for a decade, and now even Apple has recognized that it’s better than manual saving and implemented it in Mac OS Lion.