php copy file is size is zero

hello there,
I have a text file named cookie.txt and a new one like newCookie.txt..
I would like to make a little function to check if the size of newCookie.txt is zero then copy the data from cookie.txt into it..
how can I do that?
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See the php functions and The code for that should be easy to write
See attached code snippet
$newFileName = 'newCookie.txt';
$oldFileName = 'cookie.txt';
if(!is_file($newFileName) || !filesize($newFileName))
    $fp = @fopen($newFileName, 'w');
        fwrite($fp, file_get_contents($oldFileName));
    } else {
        echo 'Cannot open file for writing!';

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