Out of the box, sadly, PHPStorm doesn't make nice with the Ubuntu Unity launcher.
Typically I manage PHPStorm by extracting it to /opt and then symlinking the extracted folder to /opt/PhpStorm.
To create a nice launcher for Unity you create a desktop entry under ~/.local/share/applications
$ vim ~/.local/share/applications/jetbrains-phpstorm.desktop
Now paste the following in (adjusted for your own paths)
[Desktop Entry] Version=4.0.1 Type=Application Name=JetBrains PhpStorm Exec=/opt/PhpStorm/bin/phpstorm.sh %f Icon=/opt/PhpStorm/bin/webide.png Comment=Develop with pleasure! Categories=Development;IDE; Terminal=false StartupNotify=true StartupWMClass=jetbrains-phpstorm
Hit your windows or super key and type in 'Php' - you should see the newly created desktop entry there. Once launched and fully started, you can opt to keep PHPStorm locked to the Unity launcher for easy startup.