On the I/O Reader blog, there's two different posts that take two sides of the spectrum when it comes to what to like and dislike about PHP, both lists of features of the the language:

• 15 Cool Things About PHP That Most People Overlook - a list including the Reflection API, the Standard PHP Library, type hinting and the "magic" functions.
• 12 Things You Should Dislike About PHP - this list includes things like naming conventions, that _tostring doesn't work as (he) expected, magic quotes and register globals and safe mode

Both have their valid points and it's interesting to see how many of the points made in the first article he goes back on and mentions specific instances where it doesn't work as expected. Some of the comparisons seem a bit like he's comparing PHP to his experience in another language and not objectively on PHP's features alone.