I wasn't going to jump into this discussion but that isn't very fair. I don't use PHP myself and am not a fan of it but here are some reasons why I think it is popular:

1) It's very easy to get started with, even if you're not a great programmer (or even if you have never programmed before). Just start with pure HTML and then add a few <?php> tags. 2) Lots of PHP hosting available, much of it free. 3) Loads of frameworks and libraries available.

I'm sure a PHP fan could come up with a few more.

2 and 3 are not really advantages for PHP, as the same can be said for most any language.

I think #1 is the big reason that PHP is as popular as it is, but that "feature" has a funny smell among programmers who don't like to mix languages.