分享一个强大的采集类，还可以模拟php多进程

用法很简单：
1，采用get方法请求
Http::doGet(网址);//超市时间可忽略，默认是5秒
Http::doGet(网址,超时时间);
如echo Http::doGet(‘http://www.baidu.com‘);

2,采用post方法请求
Http::doPost(网址,数据,超时时间);

如
$url=‘http://www.canphp.com/test.php‘;
$data[‘name‘]=‘单骑‘;
$data[‘email‘]=‘[email protected]‘;
Http::doPost($url,$data,10);

test.php页面接收数据
$_POST[‘name‘];
$_POST[‘email‘];

这个http类不仅可以用来采集，还有一个很强大的作用，模拟php异步多进程。
比如有index.php和a.php,  b.php,  c.php
在index.php中
Http::doGet(‘http://www.canphp.com/a.php‘,1);
Http::doGet(‘http://www.canphp.com/b.php‘,1);
Http::doGet(‘http://www.canphp.com/c.php‘,1);

a.php,  b.php,  c.php程序分别在头部加上ignore_user_abort(true);
那么就可以实现多进程了。

原理：
通过curl或socket发送请求给a.php,  b.php,  c.php，由于超时时间比较短，只是触发了a.php,  b.php,  c.php三个页面，不需要等待数据返回，连接已中断，但是a.php,  b.php,  c.php程序中加上了ignore_user_abort(true);忽略客户端连接，还会继续执行。

具体案例可以观看很邪恶很强大的av程序(http://www.canphp.com/bbs/thread-295-1-1.html)

1. <?php
2. //数据采集，doGET,doPOST
3. class Http
4. {//类定义开始
5. //通过get方式获取数据
6. static public function doGet($url,$timeout=5)
7. {
8. $code=self::getSupport();
9. switch($code)
10. {
11. case 1:return self::curl($url,‘‘,$timeout);break;
12. case 2:return self::socketGet($url,$timeout);break;
13. case 3:return @file_get_contents($url);break;
14. default:return false;
15. }
16. }
17. //通过POST方式发送数据
18. static public function doPost($url,$data,$timeout=5)
19. {
20. $code=self::getSupport();
21. switch($code)
22. {
23. case 1:return self::curl($url,$data,$timeout);break;
24. case 2:return self::socketPost($url,$data,$timeout);break;
25. default:return false;
26. }
27. }
28. //获取支持读取远程文件的方式
29. static public function getSupport()
30. {
31. if(function_exists(‘curl_init‘))//curl方式
32. {
33. return 1;
34. }
35. else if(function_exists(‘fsockopen‘))//socket
36. {
37. return 2;
38. }
39. else if(function_exists(‘file_get_contents‘))//php系统函数file_get_contents
40. {
41. return 3;
42. }
43. else if(ini_get(‘allow_url_fopen‘)&&function_exists(‘fopen‘))//php系统函数fopen
44. {
45. return 4;
46. }
47. else
48. {
49. return 0;
50. }
51. }
52. static public function GetHttpContent($fsock=null) {
53. $out = null;
54. while($buff = @fgets($fsock, 2048)){
55. $out .= $buff;
56. }
57. fclose($fsock);
58. $pos = strpos($out, "\r\n\r\n");
59. $head = substr($out, 0, $pos); //http head
60. $status = substr($head, 0, strpos($head, "\r\n")); //http status line
61. $body = substr($out, $pos + 4, strlen($out) - ($pos + 4));//page body
62. if(preg_match("/^HTTP\/\d\.\d\s([\d]+)\s.*$/", $status, $matches)){
63. if(intval($matches[1]) / 100 == 2){
64. return $body;
65. }else{
66. return false;
67. }
68. }else{
69. return false;
70. }
71. }
72. static public function socketGet($url,$timeout=5){
73. $url2 = parse_url($url);
74. $url2["path"] = isset($url2["path"])? $url2["path"]: "/" ;
75. $url2["port"] = isset($url2["port"])? $url2["port"] : 80;
76. $url2["query"] = isset($url2["query"])? "?".$url2["query"] : "";
77. $host_ip = @gethostbyname($url2["host"]);
78. $fsock_timeout = $timeout; //超时时间
79. if(($fsock = fsockopen($host_ip, $url2[‘port‘], $errno, $errstr, $fsock_timeout)) < 0){
80. return false;
81. }
82. $request = $url2["path"] .$url2["query"];
83. $in = "GET " . $request . " HTTP/1.1\r\n";
84. $in .= "Accept: */*\r\n";
85. // $in .= "User-Agent: Payb-Agent\r\n";
86. $in .= "Host: " . $url2["host"] . "\r\n";
87. $in .= "Connection: Close\r\n\r\n";
88. if([email protected]($fsock, $in, strlen($in))){
89. @fclose($fsock);
90. return false;
91. }
92. return self::GetHttpContent($fsock);
93. }
94. static public function socketPost($url,$post_data=array(),$timeout=5){
95. $url2 = parse_url($url);
96. $url2["path"] = ($url2["path"] == "" ? "/" : $url2["path"]);
97. $url2["port"] = ($url2["port"] == "" ? 80 : $url2["port"]);
98. $host_ip = @gethostbyname($url2["host"]);
99. $fsock_timeout = $timeout; //超时时间
100. if(($fsock = fsockopen($host_ip, $url2[‘port‘], $errno, $errstr, $fsock_timeout)) < 0){
101. return false;
102. }
103. $request = $url2["path"].($url2["query"] ? "?" . $url2["query"] : "");
104. $post_data2 = http_build_query($post_data);
105. $in = "POST " . $request . " HTTP/1.1\r\n";
106. $in .= "Accept: */*\r\n";
107. $in .= "Host: " . $url2["host"] . "\r\n";
108. // $in .= "User-Agent: Lowell-Agent\r\n";
109. $in .= "Content-type: application/x-www-form-urlencoded\r\n";
110. $in .= "Content-Length: " . strlen($post_data2) . "\r\n";
111. $in .= "Connection: Close\r\n\r\n";
112. $in .= $post_data2 . "\r\n\r\n";
113. unset($post_data2);
114. if([email protected]($fsock, $in, strlen($in))){
115. @fclose($fsock);
116. return false;
117. }
118. return self::GetHttpContent($fsock);
119. }
120. static public function curl($url, $data=array(), $timeout=5)
121. {
122. $ch = curl_init();
123. if (is_array($data) && $data)
124. {
125. $formdata = http_build_query($data);
126. curl_setopt($ch, CURLOPT_POST, true);
127. curl_setopt($ch, CURLOPT_POSTFIELDS, $formdata);
128. }
129. curl_setopt($ch, CURLOPT_URL, $url);
130. curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
131. curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
132. curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
133. $result = curl_exec($ch);
134. curl_close($ch);
135. return $result;
136. }
137. }//类定义结束
138. ?>

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