Issue with getimagesize() warning, when a large file is uploaded

Question

I have a wee problem here. This is part of a string of code that validates an image file before it's uploaded.

//Check if the image is real or fake (fyi 1 is good 0 is not good)
if($uploadOK){
    $check = getimagesize($_FILES["banner_708"]["tmp_name"]);
    if($check !== false || !empty($check)) {
        $uploadOK = 1;
    } 
    else {
        $uploadOK = 0;
        array_push($banner_msg_array, "This is not a valid image.");
    }
}

The problem is when a file is too large. What ends up happening in the above code is getimagesize() evaluates to empty. Then I get my own array_push message in the else statement, but also a system error:

Warning: getimagesize(): Filename cannot be empty in

I thought that the above logic if($check !== false || !empty($check)) would eliminate this error; if it's false or empty, then go to else and push the array. It sort of does, but why the system error? How can I get rid of this?

I do have the overall code checking for file size, but it doesn't matter in what order I place it, before or after the above code, I still get this system warning when a file is too large, and I think it's because getimagesize() has nothing to evaluate. The problem is what can be changed to eliminate this?

Any help would be appreciated.

Answer 1

Check whether the file was received correctly.

if ($_FILES["banner_708"]["error"]){
    $uploadOK = 0;
    $banner_msg_array[] = "Image could not be uploaded";
} else {
    $check = getimagesize($_FILES["banner_708"]["tmp_name"]);
    if($check !== false || !empty($check)) {
        $uploadOK = 1;
    } 
    else {
        $uploadOK = 0;
        array_push($banner_msg_array, "This is not a valid image.");
    }
}