You don't need to install as root, install as user.
Code:
tar -xvzf ZendStudio-5_5_0.tar.gz
Code:
./ZendStudio-5_5_0.bin
follow the instructions on the screen
It will tell you where it will put the files
eq
Code:
/home/user/ZendStudio-5.5.0/
to launch the program type
Code:
/home/user/ZendStudio-5.5.0/Zend_Development_Environment