Mac OS comes pre-installed with apache HTTP server and PHP stack. But the bundled PHP is quite old. My machine with Mountain Lion OS (version 10.8.4) has the version 5.3.15. You can check the version of PHP on your machine using command -
$ php -v
Now if you want to use the latest version of PHP for development on Mac you can install bundled Apache HTTP server and PHP from XAMPP. For installation go to the website of XAMPP for Mac OS X - http://www.apachefriends.org/en/xampp-macosx.html and follow the 4 step installation process mentioned there. Now to start the HTTP server navigate to folder Applications->XAMPP and then double click manager-osx file to open it. It runs as root so you might need to enter root password. This opens XAMPP dashboard. Click on Manage Servers tab in the dashboard and select Apache Web Server. Then you can click the start button in the right side pane to start the server. Now you can test the installation by navigating to http://localhost. If everything is fine you will see XAMPP splash screen. Please let me know via comments if you face any issue.
Saavn’s paid service is known as Saavn Pro and Gaana’s paid service is known as Gaana+. Paid service features are only available on Android and iOS devices. Here is a comparison of both the premium services.
Saavn Pro vs Gaana+
Gaana+ offers monthly subscription at INR 170 approximately.
Saavn Pro offers two plans. Saavn Pro and Saavn Pro lite. Pro version is offered at a price of $3.99 (INR 220) per month. Pro Lite version is offered at $1.99 (INR 110) per month.
Gaana+ offers offline caching of music on Android and iOS devices. They don’t mention any limit on number of songs that can be stored offline. Gaana+ apps does not offer making caching of a single song. One can only cache an entire playlist for offline availability.
Saavn Pro also offers offline caching of music on Android and iOS devices. In Pro plan you can store upto 3 GB of songs offline. Pro lite plan offers 1 GB of songs offline. Saavn Pro app offers caching of a single song as well as playlist for offline availability.
High Quality Audio
Gaana+ offers streaming music quality upto 128kbps and offline sync upto 320kbps.
Saavn Pro offers streaming music quality upto 128kbps. They have future plans for supporting up to 320kbps quality only to their Saavn Pro customers.
Sync Across Devices
Gaana+ does not offer any sync across devices service. One has to manually mark each playlist for offline availability on all devices.
Saavn Pro offers sync across devices service. All your offline music is automatically available offline on your devices. But this feature is only available on their Pro plan. Pro lite plan does not offer sync service.
Please let me know via comment if you find any more differences in these two services.