How Can I Determine the MIME Type of a File in PHP Using REQUEST_URI?

Determining MIME Types in PHP

Question:

When developing a PHP application that handles various file types, how can one determine the MIME type of a requested file using the REQUEST_URI?

Answer:

Option 1: File Extension

A simple approach is to check the file extension in the requested URI. For example:

$ext = pathinfo($_SERVER['REQUEST_URI'], PATHINFO_EXTENSION);
switch ($ext) {
    case "jpg":
    case "jpeg":
        $mime = "image/jpeg";
        break;
    case "png":
        $mime = "image/png";
        break;
    // ...
}

Option 2: exif_imagetype (For Images)

If you're certain you're only handling images, you can leverage the exif_imagetype() function to determine the MIME type of images.

$type = exif_imagetype($_SERVER['REQUEST_URI']);
switch ($type) {
    case IMAGETYPE_JPEG:
        $mime = "image/jpeg";
        break;
    case IMAGETYPE_PNG:
        $mime = "image/png";
        break;
    // ...
}

Option 3: getID3 (External Dependency)

For more advanced file type detection, consider using the getID3 library, which supports a wide range of file types.

Option 4: mime_content_type (Deprecated)

The mime_content_type() function is deprecated and should be avoided. Use the Fileinfo PECL extension instead.

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