What is art without practical usage? Practical usage means the utility of the art. The utility of the art clearly denotes the ability to solve a problem. So considering Phing as an art, it has got practical usage. Since it has practical usage, it has got utility. Since it has utility, it clearly denotes that it can solve problems for you.
What are you waiting for?
Think build problems, common or uncommon, think Phing. The most common problems are the most commonly known headache-causing agents—some of the developers in your team might not know the database specific language, some might not know the commands specific to the operating system, and some might not be trustworthy to be allowed to handle the system permissions; hence, the logfiles or temporary file cleaning tasks.
You can write Phing tasks to tackle them all.
Can you write a Phing task to check out files from the SVN server and deploy them on a target server? Yes, you can.