PHPStorm, unlike TextMate, "forgets" the folded code areas when closing and opening the file again.
Sometimes the foldings open by themselves after search-and-replace, even though there were no matches inside the folded areas.
Is there a way to make PHPStorm remember my foldings in PHP/JavaScript/CSS files?
This is currently not possible.
There's a bunch of related issues in our tracker http://youtrack.jetbrains.net/issues/WI?q=%23Unresolved+folding