php下载远程图片函数示例(伪造来路)

2. /**
3. * @功能：下载远程图片
4. * @ bbs.it-home.org
5. */
6. function DownImageKeep($gurl, $rfurl, $filename, $gcookie="", $JumpCount=0, $maxtime=30)
7. {
8. $urlinfos = GetHostInfo($gurl);
9. $ghost = trim($urlinfos['host']);
10. if($ghost=='')
11. {
12. return FALSE;
13. }
14. $gquery = $urlinfos['query'];
15. if($gcookie=="" && !empty($rfurl))
16. {
17. $gcookie = RefurlCookie($rfurl);
18. }
19. $sessionQuery = "GET $gquery HTTP/1.1\r\n";
20. $sessionQuery .= "Host: $ghost\r\n";
21. $sessionQuery .= "Referer: $rfurl\r\n";
22. $sessionQuery .= "Accept: */*\r\n";
23. $sessionQuery .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)\r\n";
24. if($gcookie!="" && !preg_match("/[\r\n]/", $gcookie))
25. {
26. $sessionQuery .= $gcookie."\r\n";
27. }
28. $sessionQuery .= "Connection: Keep-Alive\r\n\r\n";
29. $errno = "";
30. $errstr = "";
31. $m_fp = fsockopen($ghost, 80, $errno, $errstr,10);
32. fwrite($m_fp,$sessionQuery);
33. $lnum = 0;
35. //获取详细应答头
36. $m_httphead = Array();
37. $httpstas = explode(" ",fgets($m_fp,256));
38. $m_httphead["http-edition"] = trim($httpstas[0]);
39. $m_httphead["http-state"] = trim($httpstas[1]);
40. while(!feof($m_fp))
41. {
42. $line = trim(fgets($m_fp,256));
43. if($line == "" || $lnum>100)
44. {
45. break;
46. }
47. $hkey = "";
48. $hvalue = "";
49. $v = 0;
50. for($i=0; $i {
51. if($v==1)
52. {
53. $hvalue .= $line[$i];
54. }
55. if($line[$i]==":")
56. {
57. $v = 1;
58. }
59. if($v==0)
60. {
61. $hkey .= $line[$i];
62. }
63. }
64. $hkey = trim($hkey);
65. if($hkey!="")
66. {
67. $m_httphead[strtolower($hkey)] = trim($hvalue);
68. }
69. }
71. //分析返回记录
72. if(preg_match("/^3/", $m_httphead["http-state"]))
73. {
74. if(isset($m_httphead["location"]) && $JumpCount {
75. $JumpCount++;
76. DownImageKeep($gurl,$rfurl,$filename,$gcookie,$JumpCount);
77. }
78. else
79. {
80. return FALSE;
81. }
82. }
83. if(!preg_match("/^2/", $m_httphead["http-state"]))
84. {
85. return FALSE;
86. }
87. if(!isset($m_httphead))
88. {
89. return FALSE;
90. }
91. $contentLength = $m_httphead['content-length'];
93. //保存文件
94. $fp = fopen($filename,"w") or die("写入文件：{$filename} 失败！");
95. $i=0;
96. $okdata = "";
97. $starttime = time();
98. while(!feof($m_fp))
99. {
100. $okdata .= fgetc($m_fp);
101. $i++;
103. //超时结束
104. if(time()-$starttime>$maxtime)
105. {
106. break;
107. }
109. //到达指定大小结束
110. if($i >= $contentLength)
111. {
112. break;
113. }
114. }
115. if($okdata!="")
116. {
117. fwrite($fp,$okdata);
118. }
119. fclose($fp);
120. if($okdata=="")
121. {
122. @unlink($filename);
123. fclose($m_fp);
124. return FALSE;
125. }
126. fclose($m_fp);
127. return TRUE;
128. }
130. /**
131. * 获得某页面返回的Cookie信息
132. *
133. * @access public
134. * @param string $gurl 调整地址
135. * @return string
136. */
137. function RefurlCookie($gurl)
138. {
139. global $gcookie,$lastRfurl;
140. $gurl = trim($gurl);
141. if(!empty($gcookie) && $lastRfurl==$gurl)
142. {
143. return $gcookie;
144. }
145. else
146. {
147. $lastRfurl=$gurl;
148. }
149. if(trim($gurl)=='')
150. {
151. return '';
152. }
153. $urlinfos = GetHostInfo($gurl);
154. $ghost = $urlinfos['host'];
155. $gquery = $urlinfos['query'];
156. $sessionQuery = "GET $gquery HTTP/1.1\r\n";
157. $sessionQuery .= "Host: $ghost\r\n";
158. $sessionQuery .= "Accept: */*\r\n";
159. $sessionQuery .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)\r\n";
160. $sessionQuery .= "Connection: Close\r\n\r\n";
161. $errno = "";
162. $errstr = "";
163. $m_fp = fsockopen($ghost, 80, $errno, $errstr,10) or die($ghost.'
     ');
164. fwrite($m_fp,$sessionQuery);
165. $lnum = 0;
167. //获取详细应答头
168. $gcookie = "";
169. while(!feof($m_fp))
170. {
171. $line = trim(fgets($m_fp,256));
172. if($line == "" || $lnum>100)
173. {
174. break;
175. }
176. else
177. {
178. if(preg_match("/^cookie/i", $line))
179. {
180. $gcookie = $line;
181. break;
182. }
183. }
184. }
185. fclose($m_fp);
186. return $gcookie;
187. }
189. /**
190. * 获得网址的host和query部份
191. *
192. * @access public
193. * @param string $gurl 调整地址
194. * @return string
195. */
196. function GetHostInfo($gurl)
197. {
198. $gurl = preg_replace("/^http:\/\//i", "", trim($gurl));
199. $garr['host'] = preg_replace("/\/(.*)$/i", "", $gurl);
200. $garr['query'] = "/".preg_replace("/^([^\/]*)\//i", "", $gurl);
201. return $garr;
202. }
203. ?>

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