What is the significance of using getimagesize function in PHP for image file uploads?

The getimagesize function in PHP is significant for image file uploads as it allows us to check the dimensions and type of the uploaded image before processing it further. This helps in validating the image file to ensure it meets the required criteria, such as size and format, before saving it to the server. By using getimagesize, we can prevent potential issues like uploading oversized images or non-image files.

// Check image dimensions and type before uploading
$image_info = getimagesize($_FILES["fileToUpload"]["tmp_name"]);

if($image_info !== false) {
    $image_width = $image_info[0];
    $image_height = $image_info[1];
    $image_type = $image_info[2];

    // Further validation and processing of the image can be done here
} else {
    echo "Invalid image file.";
}