来源：http://en.wikipedia.org/wiki/Remote_File_Inclusion
有一部分翻译的可能不准确，只是为了大致的说明一下什么是RFI
Remote File Inclusion (RFI) is a type of vulnerability most often found on websites, it allows an attacker to include a remote file usually through a script on the web server. The vulnerability occurs due to the use of user supplied input without proper validation. This can lead to something as minimal as outputting the contents of the file, but depending on the severity, to list a few it can lead to:
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