本文章要介绍了这篇文章是一篇关于php流下载,就是可以支持分块与断点续传文件下载,有需要的朋友可以看看,代码如下:

1. $dowmFile = dirname ( __FILE__ ) . '/Nokia - Always Here.mp3'; //要下载的文件，绝对或相对
2. $dowmName = 'Nokia - Always Here.mp3';
3. ob_start ();
4. getlocalfile ( $dowmFile, $dowmName );
5. flush ();
6. ob_flush ();
7. function getlocalfile($fname, $filename = '') {
8. $fsize = filesize ( $fname );
9. header ( 'Cache-Control: public' );
10. header ( 'Pragma: public' );
11. header ( 'Accept-Ranges: bytes' );
12. header ( 'Connection: close' );
13. header ( 'Content-Type: ' . MIMEType ( $fname ) );
14. //header('Content-Type: application/octet-stream');
15. if (isset ( $filename {0} )) {
16. header ( 'Content-Disposition: attachment;filename=' . $filename );
17. }
18. if ($fp = @fopen ( $fname, 'rb' )) {
19. $start = 0;
20. $end = $fsize;
21. $isRange = isset ( $_SERVER ['HTTP_RANGE'] ) && ($_SERVER ['HTTP_RANGE'] != '');
22. if ($isRange) {
23. preg_match ( '/^bytes=([0-9]*)-([0-9]*)$/i', $_SERVER ['HTTP_RANGE'], $match );
24. $start = $match [1];
25. $end = $match [2];
26. $isset_start = isset ( $start {0} );
27. $isset_end = isset ( $end {0} );
28. if ($isset_start && $isset_end) {
29. //分块下载
30. if ($start >= $fsize || $start < 0 || $start > $end) {
31. $start = 0;
32. $end = $fsize;
33. } else if ($end >= $fsize) {
34. $end = $fsize - $start;
35. } else {
36. $end -= $start - 1;
37. }
38. } else if ($isset_start && ! $isset_end) {
39. //指定位置到结束
40. if ($start >= $fsize || $start < 0) {
41. $start = 0;
42. $end = $fsize;
43. } else {
44. $end = $fsize - $start;
45. }
46. } else if (! $isset_start && $isset_end) {
47. //最后n个字节
48. $end = $end > $fsize ? $fsize : $end;
49. $start = $fsize - $end;
50. } else {
51. $start = 0;
52. $end = $fsize;
53. }
54. }
55. if ($isRange) {
56. fseek ( $fp, $start );
57. header ( 'HTTP/1.1 206 Partial Content' );
58. header ( 'Content-Length: ' . $end );
59. header ( 'Content-Ranges: bytes ' . $start . '-' . ($end + $start - 1) . '/' . $fsize );
60. } else {
61. header ( 'Content-Length: ' . $fsize );
62. }
63. if (function_exists ( 'fpassthru' ) && ($end + $start) == $fsize) {
64. fpassthru ( $fp );
65. } else {
66. echo fread ( $fp, $end );
67. }
68. } else {
69. header ( 'Content-Length: ' . $fsize );
70. readfile ( $fname );
71. }
72. //@header("Content-Type: ".mime_content_type($fname));
73. }
74. function MIMEType($fname) {
75. $fileSuffix = strtolower ( substr ( $fname, strrpos ( $fname, '.' ) + 1 ) );
76. switch ($fileSuffix) {
77. case 'avi' :
78. return 'video/msvideo';
79. case 'wmv' :
80. return 'video/x-ms-wmv';
81. case 'txt' :
82. return 'text/plain';
83. case 'htm' :
84. case 'html' :
85. case 'php' :
86. return 'text/html';
87. case 'css' :
88. return 'text/css';
89. case 'js' :
90. return 'application/javascript';
91. case 'json' :
92. case 'xml' :
93. case 'zip' :
94. case 'pdf' :
95. case 'rtf' :
96. case 'tar' :
97. return 'application/' . $fileSuffix;
98. case 'swf' :
99. return 'application/x-shockwave-flash';
100. case 'flv' :
101. return 'video/x-flv';
102. case 'jpe' :
103. case 'jpg' :
104. return 'image/jpeg';
105. case 'jpeg' :
106. case 'png' :
107. case 'gif' :
108. case 'bmp' :
109. case 'tiff' :
110. return 'image/' . $fileSuffix;
111. case 'ico' :
112. return 'image/vnd.microsoft.icon';
113. case 'tif' :
114. return 'image/tiff';
115. case 'svg' :
116. case 'svgz' :
117. return 'image/svg+xml';
118. case 'rar' :
119. return 'application/x-rar-compressed';
120. case 'exe' :
121. case 'msi' :
122. return 'application/x-msdownload';
123. case 'cab' :
124. return 'application/vnd.ms-cab-compressed';
125. case 'aif' :
126. return 'audio/aiff';
127. case 'mpg' :
128. case 'mpe' :
129. case 'mp3' :
130. return 'audio/mpeg';
131. case 'mpeg' :
132. case 'wav' :
133. case 'aiff' :
134. return 'audio/' . $fileSuffix;
135. case 'qt' :
136. case 'mov' :
137. return 'video/quicktime';
138. case 'psd' :
139. return 'image/vnd.adobe.photoshop';
140. case 'ai' :
141. case 'eps' :
142. case 'ps' :
143. return 'application/postscript';
144. case 'doc' :
145. case 'docx' :
146. return 'application/msword';
147. case 'xls' :
148. case 'xlt' :
149. case 'xlm' :
150. case 'xld' :
151. case 'xla' :
152. case 'xlc' :
153. case 'xlw' :
154. case 'xll' :
155. return 'application/vnd.ms-excel';
156. case 'ppt' :
157. case 'pps' :
158. return 'application/vnd.ms-powerpoint';
159. case 'odt' :
160. return 'application/vnd.oasis.opendocument.text';
161. case 'ods' :
162. return 'application/vnd.oasis.opendocument.spreadsheet';
163. default ://开源代码phpfensi.com
164. if (function_exists ( 'mime_content_type' )) {
165. $fileSuffix = mime_content_type ( $filename );
166. } else {
167. $fileSuffix = 'application/octet-stream';
168. }
169. return $fileSuffix;
170. break;
171. }
172. }