Why should you learn PHP when there are two many “better” languages available? It’s easy to learn. You can build practical web apps within a week of starting. Finally a huge number of legacy web apps such as WordPress, Drupal, and many of the open source projects that you download were coded in PHP. To be a professional you’ll need to have 5 or more languages under your belt, and although PHP may not be the one you end up preferring to use, it’s a good one to be comfortable with.
Commenting code allows you to add notations to you script to explain why it was written how it was. You can also use commenting to keep specific code from running during troubleshooting. <?php /* […]
You can use basic ASCII Text editors to write PHP code. You simply need to save the file with the .php extension.