security - PHP: What is the origin of the 'type' index in $_FILES? -


in order validate allowed mime types in file uploads rely on fileinfo extension since extension or magic database isn't available though of using type index associated each file on $_files superglobal.

so question is, index come from? suspect either comes browser (and if that's case can forged) or, likely, web server (or php) - , if case: extension mime type mapping or real thing?

it's mime type of file supplied browser through interpreting extension of file. you're right, can forged client.


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