$resim = 'uzakresim';
$kaydet = 'image.jpg';

$ch = curl_init($resim);
$fp = fopen($kaydet, "wb");

curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);

curl_exec($ch);
curl_close($ch);
fclose($fp);