How to implement secure input validation for file uploads in PHP projects? Posted on 06 September 2008 When you include more than just two files, it may result in the need to implement secure input validation for a couple files. To be specific, more than two files will have a common header, and with files being hosted in different servers it may be better for security to distinguish the content that comes from the code. It does not matter if the header is placed in an uploaded file, or in a separate folder (e.g., with a script), so it is best to not overthink or reduce the upload size. The problem with the design of files is that they create, or perhaps persist, a security hole. PHP documents can have code that is malicious in some way, but on some files, the security of code is more hard to enforce. In my experience, it is actually acceptable for my colleagues to skip saving the file to a server rather than overwriting the document using PHP’s error handling mechanism. The only way for secure users to interactively connect to a file like it would with a normal file is if it were secured to do so. Without any idea how to implement secure input validation to your own code, here is some code that can be used to build secure input formatting specifications for such files (using PHP’s php_cbc_encoder to encode the file name):
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