I have seen ONE THING, that PHP does, that I have not yet seen Perl do.
I have seen several.
PHP has one central website for news, documentation, downloads, etc (php.net). Perl websites are scattered all over the place: perldoc, useperl, perlfaq, etc.
PHP is very easy to install. mod_perl is not.
PHP is open source, but has significant corporate backing (i.e, Zend) that Perl lacks.
The PHP community is trying hard to make the next version of PHP a worthy contender to Java in the Enterprise world. The Perl6 community could care less.