PHP通过url下载远程图片到本地

function GrabImage($url,$filename) {

	if($url==""):return false;endif;

	ob_start();

	readfile($url);

	$img = ob_get_contents();

	ob_end_clean();

	$size = strlen($img);

	//"../../images/books/"为存储目录，$filename为文件名

	$fp2=@fopen("upfile/".$filename, "a");

	fwrite($fp2,$img);

	fclose($fp2);

	return $filename;

}

$filename=GrabImage("http://pic.111cn.net/enkj976.gif","11.jpg");

$men = new memcache();

    // you can replace localhost by memcached server ip addr and port no.

$men->connect('localhost','11211');

$men->add("mystr","this is a test",MEMCACHE_COMPRESSED,3600);

$str=$men->get("mystr");

echo $str;