Re:Why is this needed at all? (Score 1)

I have to agree - these tools could be very useful in getting to grips with a bunch of code that's been written by someone else. However, if you're writing the app yourself, sloppy code (concatenating queries on the fly, ignoring functions such as mysql_real_escape_string(), etc.) and not validating user input are your main concerns. PHP is not the problem if used correctly!