Xakep is a magazine mostly about the other kind of hacking (the meaning journalists use). Which means there are lots of black hat and script kiddie materials in there, along with the white hat kind of hacks. Btw, 'xakep' is 'hacker' in Russian, but spelled using Latin characters.

This material is definitely on the black hat side of things, but it is still important to be aware of these types of attacks. Sadly, PHP include bugs and SQL injections are still very widespread.