CSRF: add $_FILE to list of superglobals
CSRF: add $_FILE to list of superglobals

It will give an error by default.

mediarain/WordPress-Coding-Standards,mediarain/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,borkweb/WordPress-Coding-Standards,xwp/WordPress-Coding-Standards,paulschreiber/WordPress-Coding-Standards,xwp/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,paulschreiber/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,paulschreiber/WordPress-Coding-Standards,mattyrob/WordPress-Coding-Standards,jrfnl/WordPress-Coding-Standards,borkweb/WordPress-Coding-Standards,borkweb/WordPress-Coding-Standards,jrfnl/WordPress-Coding-Standards,WordPress-Coding-Standards/WordPress-Coding-Standards,xwp/WordPress-Coding-Standards,paulschreiber/WordPress-Coding-Standards,borkweb/WordPress-Coding-Standards,jrfnl/WordPress-Coding-Standards,WordPress-Coding-Standards/WordPress-Coding-Standards,xwp/WordPress-Coding-Standards,jrfnl/WordPress-Coding-Standards,WordPress-Coding-Standards/WordPress-Coding-Standards,WordPress-Coding-Standards/WordPress-Coding-Standards