这篇文章主要介绍了PHP下载远程图片并保存到本地方法总结的相关资料,需要的朋友可以参考下。

1.获取远程文件大小及信息的函数

1. function getFileSize($url){
2. $url = parse_url($url);
3. if($fp = @fsockopen($url['host'],emptyempty($url['port'])?80:$url['port'],$error)){
4. fputs($fp,"GET ".(emptyempty($url['path'])?'/':$url['path'])." HTTP/1.1\r\n");
5. fputs($fp,"Host:$url[host]\r\n\r\n");
6. while(!feof($fp)){
7. $tmp = fgets($fp);
8. if(trim($tmp) == ''){
9. break;
10. }else if(preg_match('/Content-Length:(.*)/si',$tmp,$arr)){
11. return trim($arr[1]);
12. }
13. }
14. return null;
15. }else{
16. return null;
17. }
18. }
19. echo getFileSize(<a href="http://www.phpfensi.com/download/xml.rar">http://www.phpfensi.com/download/xml.rar</a>)

2.图片

1. //记录程序开始的时间
2. $BeginTime=getmicrotime();
3. function GrabImage($url,$filename="") {
4. if($url==""):return false;endif;
5. if($filename=="") {
6. $ext=strrchr($url,".");
7. if($ext!=".gif" && $ext!=".jpg"):return false;endif;
8. $filename=date("dMYHis").$ext;
9. }
10. ob_start();
11. readfile($url);
12. $img = ob_get_contents();
13. ob_end_clean();
14. $size = strlen($img);
15. $fp2=@fopen($filename, "a");
16. fwrite($fp2,$img);
17. fclose($fp2);
18. return $filename;
19. }
20. $img=GrabImage("http://www.phpfensi.com/images/_1978837_detector_ap100.jpg","");
21. if($img):echo '<pre><img src="'.$img.'"></pre>';else:echo "false";endif;
22. //记录程序运行结束的时间
23. $EndTime=getmicrotime();
24. //返回运行时间
25. exit($EndTime-$BeginTime);

3.全文下载图片

1. if(!emptyempty($saveremoteimg))
2. {
3. $body = stripslashes($body);
4. $img_array = array();
5. preg_match_all("/(src|SRC)=[\"|'| ]{0,}(http:\/\/(.*)\.(gif|jpg|jpeg|bmp|png))/isU",$body,$img_array);
6. $img_array = array_unique($img_array[2]);
7. set_time_limit(0);
8. $imgUrl = $img_dir."/".strftime("%Y%m%d",time());
9. $imgPath = $base_dir.$imgUrl;
10. $milliSecond = strftime("%H%M%S",time());
11. if(!is_dir($imgPath)) @mkdir($imgPath,0777);
12. foreach($img_array as $key =>$value)
13. {
14. $value = trim($value);
15. $get_file = @file_get_contents($value);
16. $rndFileName = $imgPath."/".$milliSecond.$key.".".substr($value,-3,3);
17. $fileurl = $imgUrl."/".$milliSecond.$key.".".substr($value,-3,3);
18. if($get_file)
19. {
20. $fp = @fopen($rndFileName,"w");
21. @fwrite($fp,$get_file);
22. @fclose($fp);
23. }
24. $body = ereg_replace($value,$fileurl,$body);
25. }
26. $body = addslashes($body);
27. }

4.PHP远程文件下载类（支持断点续传）

1）.功能:支持断点续传的下载,能计算传输率,能控制传输率

简易使用方法:

$object = new httpdownload();

$object->set_byfile($file);//服务器文件名,包括路径

$object->filename = $filename;//下载另存为的文件名

$object->download();

类文件：

1. <?
2. class httpdownload {
3. var $data = null;
4. var $data_len = 0;
5. var $data_mod = 0;
6. var $data_type = 0;
7. var $data_section = 0; //section download
8. var $sentSize=0;
9. var $handler = array('auth' => null);
10. var $use_resume = true;
11. var $use_autoexit = false;
12. var $use_auth = false;
13. var $filename = null;
14. var $mime = null;
15. var $bufsize = 2048;
16. var $seek_start = 0;
17. var $seek_end = -1;
18. var $totalsizeref = 0;
19. var $bandwidth = 0;
20. var $speed = 0;
21. function initialize() {
22. global $HTTP_SERVER_VARS;
23. if ($this->use_auth) //use authentication {
24. if (!$this->_auth()) //no authentication {
25. header('WWW-Authenticate: Basic realm="Please enter your username and password"');
26. header('HTTP/1.0 401 Unauthorized');
27. header('status: 401 Unauthorized');
28. if ($this->use_autoexit) exit();
29. return false;
30. }
31. }
32. if ($this->mime == null) $this->mime = "application/octet-stream"; //default mime
33. if (isset($_SERVER['HTTP_RANGE']) || isset($HTTP_SERVER_VARS['HTTP_RANGE'])) {
34. if (isset($HTTP_SERVER_VARS['HTTP_RANGE'])) $seek_range = substr($HTTP_SERVER_VARS['HTTP_RANGE'] , strlen('bytes='));
35. else $seek_range = substr($_SERVER['HTTP_RANGE'] , strlen('bytes='));
36. $range = explode('-',$seek_range);
37. if ($range[0] > 0) {
38. $this->seek_start = intval($range[0]);
39. }
40. if ($range[1] > 0) $this->seek_end = intval($range[1]);
41. else $this->seek_end = -1;
42. if (!$this->use_resume) {
43. $this->seek_start = 0;
44. //header("HTTP/1.0 404 Bad Request");
45. //header("Status: 400 Bad Request");
46. //exit;
47. //return false;
48. } else {
49. $this->data_section = 1;
50. }
51. } else {
52. $this->seek_start = 0;
53. $this->seek_end = -1;
54. }
55. $this->sentSize=0;
56. return true;
57. }
58. function header($size,$seek_start=null,$seek_end=null) {
59. header('Content-type: ' . $this->mime);
60. header('Content-Disposition: attachment; filename="' . $this->filename . '"');
61. header('Last-Modified: ' . date('D, d M Y H:i:s \G\M\T' , $this->data_mod));
62. if ($this->data_section && $this->use_resume) {
63. header("HTTP/1.0 206 Partial Content");
64. header("Status: 206 Partial Content");
65. header('Accept-Ranges: bytes');
66. header("Content-Range: bytes $seek_start-$seek_end/$size");
67. header("Content-Length: " . ($seek_end - $seek_start + 1));
68. } else {
69. header("Content-Length: $size");
70. }
71. }
72. function download_ex($size) {
73. if (!$this->initialize()) return false;
74. ignore_user_abort(true);
75. //Use seek end here
76. if ($this->seek_start > ($size - 1)) $this->seek_start = 0;
77. if ($this->seek_end <= 0) $this->seek_end = $size - 1;
78. $this->header($size,$seek,$this->seek_end);
79. $this->data_mod = time();
80. return true;
81. }
82. function download() {
83. if (!$this->initialize()) return false;
84. try {
85. error_log("begin download\n", 3,"/usr/local/www/apache22/LOGS/apache22_php.err");
86. $seek = $this->seek_start;
87. $speed = $this->speed;
88. $bufsize = $this->bufsize;
89. $packet = 1;
90. //do some clean up
91. @ob_end_clean();
92. $old_status = ignore_user_abort(true);
93. @set_time_limit(0);
94. $this->bandwidth = 0;
95. $size = $this->data_len;
96. if ($this->data_type == 0) //download from a file {
97. $size = filesize($this->data);
98. if ($seek > ($size - 1)) $seek = 0;
99. if ($this->filename == null) $this->filename = basename($this->data);
100. $res = fopen($this->data,'rb');
101. if ($seek) fseek($res , $seek);
102. if ($this->seek_end < $seek) $this->seek_end = $size - 1;
103. $this->header($size,$seek,$this->seek_end); //always use the last seek
104. $size = $this->seek_end - $seek + 1;
105. while (!(connection_aborted() || connection_status() == 1) && $size > 0) {
106. if ($size < $bufsize) {
107. echo fread($res , $size);
108. $this->bandwidth += $size;
109. $this->sentSize+=$size;
110. } else {
111. echo fread($res , $bufsize);
112. $this->bandwidth += $bufsize;
113. $this->sentSize+=$bufsize;
114. }
115. $size -= $bufsize;
116. flush();
117. if ($speed > 0 && ($this->bandwidth > $speed*$packet*1024)) {
118. sleep(1);
119. $packet++;
120. }
121. }
122. fclose($res);
123. }
124. elseif ($this->data_type == 1) //download from a string
125. {
126. if ($seek > ($size - 1)) $seek = 0;
127. if ($this->seek_end < $seek) $this->seek_end = $this->data_len - 1;
128. $this->data = substr($this->data , $seek , $this->seek_end - $seek + 1);
129. if ($this->filename == null) $this->filename = time();
130. $size = strlen($this->data);
131. $this->header($this->data_len,$seek,$this->seek_end);
132. while (!connection_aborted() && $size > 0) {
133. if ($size < $bufsize) {
134. $this->bandwidth += $size;
135. $this->sentSize+=$size;
136. } else {
137. $this->bandwidth += $bufsize;
138. $this->sentSize+=$bufsize;
139. }
140. echo substr($this->data , 0 , $bufsize);
141. $this->data = substr($this->data , $bufsize);
142. $size -= $bufsize;
143. flush();
144. if ($speed > 0 && ($this->bandwidth > $speed*$packet*1024)) {
145. sleep(1);
146. $packet++;
147. }
148. }
149. } else if ($this->data_type == 2) {
150. //just send a redirect header
151. header('location: ' . $this->data);
152. }
153. if($this->totalsizeref==$this->sentSize )error_log("end download\n", 3,"/usr/local/www/apache22/LOGS/apache22_php.err");
154. else error_log("download is canceled\n", 3,"/usr/local/www/apache22/LOGS/apache22_php.err");
155. if ($this->use_autoexit) exit();
156. //restore old status
157. ignore_user_abort($old_status);
158. set_time_limit(ini_get("max_execution_time"));
159. }
160. catch(Exception $e) {
161. error_log("cancel download\n".$e, 3,"/usr/local/www/apache22/LOGS/apache22_php.err");
162. }
163. return true;
164. }
165. function set_byfile($dir) {
166. if (is_readable($dir) && is_file($dir)) {
167. $this->data_len = 0;
168. $this->data = $dir;
169. $this->data_type = 0;
170. $this->data_mod = filemtime($dir);
171. $this->totalsizeref = filesize($dir);
172. return true;
173. } else return false;
174. }
175. function set_bydata($data) {
176. if ($data == '') return false;
177. $this->data = $data;
178. $this->data_len = strlen($data);
179. $this->data_type = 1;
180. $this->data_mod = time();
181. return true;
182. }
183. function set_byurl($data) {
184. $this->data = $data;
185. $this->data_len = 0;
186. $this->data_type = 2;
187. return true;
188. }
189. function set_lastmodtime($time) {
190. $time = intval($time);
191. if ($time <= 0) $time = time();
192. $this->data_mod = $time;
193. }
194. function _auth() {
195. if (!isset($_SERVER['PHP_AUTH_USER'])) return false;
196. if (isset($this->handler['auth']) && function_exists($this->handler['auth'])) {
197. return $this->handler['auth']('auth' , $_SERVER['PHP_AUTH_USER'],$_SERVER['PHP_AUTH_PW']);
198. } else return true; //you must use a handler
199. }
200. }
201. ?>

5. php 使用GD库下载远程图片

1. <?php
2. $imgname = "http://imgdujia.kuxun.cn/newpic/929/812929/4.jpg";
3. $src_im = imagecreatefromjpeg($imgname);
4. $srcW = ImageSX($src_im); //获得图像的宽
5. $srcH = ImageSY($src_im); //获得图像的高
6. $dst_im = ImageCreateTrueColor($srcW,$srcH); //创建新的图像对象
7. imagecopy($dst_im, $src_im, 0, 0, 0, 0, $srcW, $srcH);
8. imagejpeg($dst_im, "newpic.jpg"); //创建缩略图文件
9. echo "<img src="newpic.jpg" mce_src="newpic.jpg"></img>";
10. ?>
11. <?php
12. header("Content-type: image/png");
13. $im = imagecreatefromjpeg("http://postimg.mop.com/200602/02/74/122374/200602022335325121.JPG");
14. $white = imagecolorallocate($im, 0xF9, 0xD7, 0xCD);
15. imagefill($im, 0, 0,$white);
16. $text_color = imagecolorallocate($im, 233, 14, 91);
17. imagestring($im, 1, 5, 5, "A Simple Text String", $text_color);
18. imagepng($im);
19. imagedestroy($im);
20. ?>

注意这个要把PHP分配内存调大，应用时用大内存服务器