// Other variables
    $MAX_FILENAME_LENGTH = 260;
    $file_name = $_FILES[$upload_name]['name'];
    //echo "testing-".$file_name."<br>";
    //$file_name = strtolower($file_name);
    $file_extension = end(explode('.', $file_name)); //ERROR ON THIS LINE
    $uploadErrors = array(
        0=>'There is no error, the file uploaded with success',
        1=>'The uploaded file exceeds the upload max filesize allowed.',
        2=>'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form',
        3=>'The uploaded file was only partially uploaded',
        4=>'No file was uploaded',
        6=>'Missing a temporary folder'
    );

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