$your_array[0]='http://www.google.ru/intl/en_com/images/logo_plain.png';
$your_array[1]='http://img.yandex.net/i/www/logo.png';
for ($i=0; $i<count($your_array); $i++)
{
    $pic='';
     $fp= fopen($your_array[$i],"r");
        do {
            $data = @fread($fp, 8192);
            if (strlen($data) == 0)
            break;
            $pic .= $data;
           } while (true);
    $fp = fopen($i.".png", "w+");
    $result = fwrite($fp,$pic);
    fclose($fp);
}