Re: mime-type related to extension?

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The beginning of the jpeg file in hex looks like this:

FF D8 FF

perhaps you could test for that occurrence.  Be aware that the occurrence of
FF D8 FF must be in each jpg file -- it does not mean that the occurrence of
FF D8 FF is found only in a jpg file.

http://filext.com/detaillist.php?extdetail=JPG

you could also try http://www.jpeg.org/index.html


Mark Cain


----- Original Message -----
From: "mel list_php" <list_php@xxxxxxxxxxxxx>
To: <php-db@xxxxxxxxxxxxx>
Sent: Wednesday, April 27, 2005 4:03 AM
Subject: FW:  mime-type related to extension?


> Hi I sent this on 21st of april and got no answer...
> there is no way to check the "real" mime type of a file?
> even a file without extension?
> thanks,
> melanie
>
>
> >From: "mel list_php" <list_php@xxxxxxxxxxxxx>
> >To: php-db@xxxxxxxxxxxxx
> >Subject:  mime-type related to extension?
> >Date: Thu, 21 Apr 2005 13:45:45 +0000
> >
> >Hi guys!
> >
> >I have a basic form to upload files, my problem is about the mime type.
> >I use $type= $_FILES[$file_uploaded]['type']; to check the mime-type of
the
> >fila as I want to allow only .jpeg.
> >I have then a test like:
> >if  ($type=="image/pjpeg" || $type=="image/jpeg")
> >{
> >...
> >}
> >
> >Upload working fine if I send "red.jpg".
> >However if I rename the file in "red", php recognizes it as
> >application/octet-stream and not jpeg.
> >I'm working under linux and for me the extension is not required for a
> >file, I thought the mime-type was encoded in the file itself and was
> >independent of the extension.
> >Any clue on that?
> >Any other php function I should look at?
> >The cookbook and pear both use $_FILES[ ] ['type'] so I have no idea
here.
> >
> >Thanks,
> >Melanie
> >
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