How can errors related to image file types be prevented in PHP scripts?

Errors related to image file types in PHP scripts can be prevented by checking the file type before processing it. This can be done by using the `getimagesize()` function to get the image type and then validating it against a list of allowed image types. If the file type is not allowed, an error message can be displayed or the script can be terminated.

// Check if the uploaded file is an image
$image_info = getimagesize($_FILES["file"]["tmp_name"]);
$allowed_types = array(IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_GIF);

if (!in_array($image_info[2], $allowed_types)) {
    die("Invalid image file type. Only JPEG, PNG, and GIF files are allowed.");
}

// Process the image file
// Your code to process the image goes here