How Can I Accurately Determine a File\'s MIME Type in PHP Using REQUEST_URI?

Determining MIME Types in PHP

When working with files, it's crucial to identify their MIME types for proper processing. In PHP, how can you accurately determine a file's MIME type based on the REQUEST_URI?

Using File Extensions

One common approach is to examine the extension of the requested file. In the given index.php file that handles all requests:

include('/www/site'.$_SERVER['REQUEST_URI']);

You could use the pathinfo() function to extract the file extension:

$filename = $_SERVER['REQUEST_URI'];
$extension = pathinfo($filename, PATHINFO_EXTENSION);

Based on the extension, you can determine the MIME type using an associative array or switch statement.

Using Exif Data

If you're dealing exclusively with images, you can utilize the exif_imagetype() function:

$imageType = exif_imagetype($filename);
$mimeType = image_type_to_mime_type($imageType);

Using getID3 Library

For broader file type identification, the getID3 library is recommended:

require_once '/path/to/getID3/getid3.php';
$getID3 = new getID3();
$fileinfo = $getID3->analyze($filename);
$mimeType = $fileinfo['mime_type'];

Using mime_content_type Function

The mime_content_type() function can also be used, but it's deprecated and relies on the Fileinfo PECL extension:

$mimeType = mime_content_type($filename);

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