PhpStorm 7 supports YUI Compressor for compressing CSS and JS files, but doesn’t come with it already installed. Don’t worry it’s one of the easier libraries to get working with PhpStorm on Windows.
There isn’t anything to install. Just download the latest JAR file from the github repo and place it in an easy to locate folder.
YUI Compressor can be downloaded from here: https://github.com/yui/yuicompressor/releases
If you have PhpStorm 7 installed you should already have Java and everything needed to run YUI Compressor. Verify that you’re able to execute the library by running YUI from the command line.
If it doesn’t work and you need to install Java JRE, then download it here: http://java.com