I need to install 2 version of Eclipse. One for Java and one for PHP. Should I expect that some hidden folder/file is gonna be overridden by both installation? I downloaded to standalone installation package from the eclipse download page.
SnapOverflow
Eclipse installation is actually a zip file that can be extracted into some folder of your choice. You may have two Eclipse installed by naming the directories with a different name (e.g. eclipse_java and eclipse_php).
There is no problem with that because Eclipse doesn't store anything outside of its directory and the Workspace directory.
Typically, you don't need to have separate Eclipse installations for different environments. The persepctive concept is made to switch from different tasks, and you can easily download different plugins.