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How to get file extension?

 
Siripa Siangklom
Ranch Hand
Posts: 79
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A content-type/mime-type to file extension mapping is ambiguous. For example:
image/jpeg can be .jpg or .jpeg file.
How to get file extension exactly from content type?
 
Frank Carver
Sheriff
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There is no way to do this. In fact, there is no particular reason why a file should even have a file extension.
Can you explain a little more about what you are trying to achieve by doing this? It's quite likely we can come up with alternative solutions.
 
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