PHP Zend attack on Wordprss

Hi, in my hosting account i got attacked by php zend attack which infected all my php files.

regardless it is of wordpress or any other script if it is php it will get hit.

following are the codes i can see above every php file.

[Code moderated. Please do not post hack code blocks in the forums. If absolutely necessary, use the pastebin]

Anyone has any idea how can i fix it?
i can remove this code manually from every file but these are around 1000 files so any instant solution?

Help will be much appreciated.

Thanks
Zee