PHP isn't going to ruin you, but if you're comfortable with Python then why bother? edit: I should be more clear here. There are lots of good reasons to learn

PHP isn't going to ruin you, but if you're comfortable with Python then why bother? edit: I should be more clear here. There are lots of good reasons to learn PHP, eg. you want to work on a project or job that uses it. If you want to learn it to expose yourself to new things, some other language is probably a better choice. If you want to learn it because you think that it's a better choice for a particular application than Python, I suspect you're wrong.