How to detemine file extension on php upload?

I've read something about MIME and finfo() but I didn't understand!

Also I tried these:

if ($_FILES["uploadedFile"]["type"] == "text/docx"/*or == document/docx*/) echo "1";

It is obviously that it won't work. When I echo $_FILES['uploadedFile']['type']; then I saw this for a word document(My server is Linux):

application/vnd.openxmlformats-officedocument.wordprocessingml.document

So must I use: ?

if ($_FILES["uploadedFile"]["type"] == "application/vnd.openxmlformats-officedocument.wordprocessingml.document")

What is an easy and reliable way to find file extension(Not only Images)? (I mean using some variables which are not filled on client side)

-------------Problems Reply------------

If you are using php 5.3, you can get true mime-type:

$finfo = finfo_open();
$file = $_FILES["uploadedFile"];
finfo_file($finfo, $file, FILEINFO_MIME_TYPE);
finfo_close($finfo);

More Info:

  • http://php.net/manual/en/function.finfo-open.php

How about

$file = $_FILES['uploadedFile'['name'];
$pathparts = pathinfo($file);
$ext = $pathparts['extension'];

This will give you the actual file extension to work with.

The best way to determine the file type is by examining the first few bytes of a file – referred to as “magic bytes”. Magic bytes are essentially signatures that vary in length between 2 to 40 bytes in the file headers, or at the end of a file.

your best bet is PECL extension called Fileinfo.

As of PHP 5.3, Fileinfo is shipped with the main distribution and is enabled by default

// in PHP 4 :
$fhandle = finfo_open(FILEINFO_MIME);
$mime_type = finfo_file($fhandle,$file); // e.g. gives for example "image/jpeg" for a jpeg file

// in PHP 5 you can do :

$file_info = new finfo(FILEINFO_MIME); // object oriented approach!
$mime_type = $file_info->buffer(file_get_contents($file));

Category:php Views:1 Time:2012-02-22

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