实际上是毫无作用的函数了~因为现在的域名商都很滑。很多域名只要注册了，就算不使用也会被默认指向一个域名商的网址。所以即便探过去，都会返回一个200值。 = = 这也是没办法的事。
array( [0] => http/1.1 200 ok [1] => date: sat, 29 may 2004 12:28:13 gmt [2] => server: apache/1.3.27 (unix) (red-hat/linux) [3] => last-modified: wed, 08 jan 2003 23:11:55 gmt [4] => etag: 3f80f-1b6-3e1cb03b [5] => accept-ranges: bytes [6] => content-length: 438 [7] => connection: close [8] => content-type: text/html)array( [0] => http/1.1 200 ok [date] => sat, 29 may 2004 12:28:14 gmt [server] => apache/1.3.27 (unix) (red-hat/linux) [last-modified] => wed, 08 jan 2003 23:11:55 gmt [etag] => 3f80f-1b6-3e1cb03b [accept-ranges] => bytes [content-length] => 438 [connection] => close [content-type] => text/html)