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I have an image upload form with which I call multiple functions before uploading the file such as checking the size and dimensions, and that it is in a valid image. The code works, but calling the functions and dealing with the results seems quite cumbersome and complex.

Is there a tidier way of structuring the code?

This is what I currently have:

//Upload an image
if(checkvalidfile("img",$ext)){
    if(checksize($size, 524288)) {
        if(checkdimensions($tmp, 300)) {
            $newfilename = renamefile($ext);
            recordfileindb($brand_id, $newfilename, $mysqli);
            uploadfile($tmp, $bucket, "user_docs/agency_".$agency_id."/brand_logos/", $newfilename, $s3);
            header('Location: ./message.php?action=newlogo'); 
        } else {
            echo "Your image can't be bigger than 300 x 300px";
            die;
        }
    } else {
        echo "File size is too big!";
        die;
    }
} else {
    echo "Not a valid file";
    die;
}
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Yes, there's room for a lot of improvement here!

First of all, you can "break early" to avoid excessive indentation. Since die terminates the script, you can check if the file is not valid.

Secondly, instead of echoing first and die later, you can call die with a parameter.

This code works in the same way, but is cleaner:

if (!checkvalidfile("img",$ext)) {
    die("Not a valid file");
}
if (!checksize($size, 524288)) {
    die ("File size is too big!");
}

if (!checkdimensions($tmp, 300)) {
    die("Your image can't be bigger than 300 x 300px");
}

$newfilename = renamefile($ext);
recordfileindb($brand_id, $newfilename, $mysqli);
uploadfile($tmp, $bucket, "user_docs/agency_".$agency_id."/brand_logos/", $newfilename, $s3);
header('Location: ./message.php?action=newlogo'); 
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