[Exlpoit in php file.]

How I can discover an exploit in a php file.I know php but I dont know where to look.Is there a guide for this.

[I want to teach myself.]

Try; "Hacking - The Art of Exploitation" by Jon Erickson.

See if that'll suit your needs.

Sry I have The Shellcoder’s Handbook.Something else?

[I want to teach myself.]

but I do not ask how to remove trojan, I wonder how the Trojans and what techniques used

[I want to teach myself.]

But i want books.

[I want to teach myself.]

Well I'm not new to programming so I do not care. I have done trojan on pythonthough somewhat primativen.

[I want to teach myself.]

I want to know exactly what techniques used Trojans. Not just generalities.

[I want to teach myself.]

What book will recommend me for trojans?