1. $post =1;
2. $url = parse_url($url);
3. $host ='http://www.phpfensi.com';
4. $path ='/';
5. $query ='?action=phpfensi.com';
6. $port =80;
7. if($post) {
8. $out = "post $path http/1.0 ";
9. $out .= "accept: */* ";
10. //$out .= "referer: $boardurl ";
11. $out .= "accept-language: zh-cn ";
12. $out .= "content-type: application/x-www-form-urlencoded ";
13. $out .= "user-agent: $_server[http_user_agent] ";
14. $out .= "host: $host ";
15. $out .= 'content-length: '.strlen($post)." ";
16. $out .= "connection: close ";
17. $out .= "cache-control: no-cache ";
18. $out .= "cookie: $cookie ";
19. $out .= $post;
20. } else {
21. $out = "get $path http/1.0 ";
22. $out .= "accept: */* ";
23. //$out .= "referer: $boardurl ";
24. $out .= "accept-language: zh-cn ";
25. $out .= "user-agent: $_server[http_user_agent] ";
26. $out .= "host: $host ";
27. $out .= "connection: close ";
28. $out .= "cookie: $cookie ";
29. }
30. $fp = @fsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout);
31. if(!$fp)
32. {
33. return '';//note $errstr : $errno
34. } else {
35. return '成功访问';
36. }

fsockopen语法:resource fsockopen(string $hostname [,int $port = -1 [, int &$errno [,string &$errstr [, float $timeout = ini_get("default_socket_timeout") ]]]] )

启动一个套接字连接到指定的主机的资源,php支持在互联网领域的目标和unix在所支持的套接字传输列表说明,所支持的传输列表也可以检索使用stream_get_transports（）.

该插座预设会被启用,阻塞模式,你可以切换到非阻塞模式使用stream_set_blocking（）,如果上面实例看不懂,就来看个简的吧,代码如下:

1. $fp = fsockopen("www.phpfensi.com", 80, $errno, $errstr, 30);
2. if (!$fp) {
3. echo "$errstr ($errno)

   " >;

4. } else {
5. $out = "get / http/1.1 ";
6. $out .= "host: www.phpfensi.com";
7. $out .= "connection: close ";
8. fwrite($fp, $out);
9. while (!feof($fp)) {
10. echo fgets($fp, 128);
11. }
12. fclose($fp);
13. }