unless you are planning on running ( and know how) to run PHP on your own computer you need a "host" that runs PHP. Most scripts around are based on PHP, so this may be were your confusion starts. I use www.freepgs.com.
There are plenty to choose from. They used to be free, but now charge a one
time fee of $3USD for 50MBS and unlimited bandwidth server space. They support PHP.
Feel free to find another, once you do, we can go to step 2.