$img='http://www.hede.com/hedee.jpg';
$fullpath = basename($img);

    $ch = curl_init ($img);

    curl_setopt($ch, CURLOPT_HEADER, 0);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);

    $data=curl_exec($ch);

    curl_close ($ch);

    if(file_exists($fullpath)){

        unlink($fullpath);

    }

    $fp = fopen($fullpath,'x');

    fwrite($fp, $data);

    fclose($fp);