Are there any security concerns to consider when processing image files in PHP, especially when determining their type?

When processing image files in PHP, one security concern to consider is ensuring that the file type is actually an image to prevent malicious files from being uploaded. One way to address this is by using the `getimagesize()` function to check the MIME type of the file and verify that it is an allowed image type before processing it further.

// Check if the uploaded file is an image
$image_info = getimagesize($_FILES["file"]["tmp_name"]);
if($image_info === false) {
    // Not an image file, handle error
    die("Only image files are allowed.");
}

// Process the image further
// Your code to handle the image goes here