在php中获取文件的mime类型方法有很多种,我们来介绍直接利用mime_content_type()函数判断获取mime类型即可了.

mime_content_type返回指定文件的MIME类型,用法,代码如下:

1. echo mime_content_type ( 'php.gif' ) . "n" ;
2. echo mime_content_type ( 'test.php' );

输出:image/gif,text/plain,但是此函数在php5.3.0以后就不可用了,如果你是php5.3.0以后版本我们可使用如下代码来操作:

1. $finfo = finfo_open(FILEINFO_MIME);
2. $mimetype = finfo_file($finfo, $filename);
3. finfo_close($finfo);

下面介绍用户自定的我这个是没有php版本限制,代码如下:

1. <?php
2. $mime = array (
3. //applications
4. 'ai' => 'application/postscript',
5. 'eps' => 'application/postscript',
6. 'exe' => 'application/octet-stream',
7. 'doc' => 'application/vnd.ms-word',
8. 'xls' => 'application/vnd.ms-excel',
9. 'ppt' => 'application/vnd.ms-powerpoint',
10. 'pps' => 'application/vnd.ms-powerpoint',
11. 'pdf' => 'application/pdf',
12. 'xml' => 'application/xml',
13. 'odt' => 'application/vnd.oasis.opendocument.text',
14. 'swf' => 'application/x-shockwave-flash',
15. // archives
16. 'gz' => 'application/x-gzip',
17. 'tgz' => 'application/x-gzip',
18. 'bz' => 'application/x-bzip2',
19. 'bz2' => 'application/x-bzip2',
20. 'tbz' => 'application/x-bzip2',
21. 'zip' => 'application/zip',
22. 'rar' => 'application/x-rar',
23. 'tar' => 'application/x-tar',
24. '7z' => 'application/x-7z-compressed',
25. // texts
26. 'txt' => 'text/plain',
27. 'php' => 'text/x-php',
28. 'html' => 'text/html',
29. 'htm' => 'text/html',
30. 'js' => 'text/javascript',
31. 'css' => 'text/css',
32. 'rtf' => 'text/rtf',
33. 'rtfd' => 'text/rtfd',
34. 'py' => 'text/x-python',
35. 'java' => 'text/x-java-source',
36. 'rb' => 'text/x-ruby',
37. 'sh' => 'text/x-shellscript',
38. 'pl' => 'text/x-perl',
39. 'sql' => 'text/x-sql',
40. // images
41. 'bmp' => 'image/x-ms-bmp',
42. 'jpg' => 'image/jpeg',
43. 'jpeg' => 'image/jpeg',
44. 'gif' => 'image/gif',
45. 'png' => 'image/png',
46. 'tif' => 'image/tiff',
47. 'tiff' => 'image/tiff',
48. 'tga' => 'image/x-targa',
49. 'psd' => 'image/vnd.adobe.photoshop',
50. //audio
51. 'mp3' => 'audio/mpeg',
52. 'mid' => 'audio/midi',
53. 'ogg' => 'audio/ogg',
54. 'mp4a' => 'audio/mp4',
55. 'wav' => 'audio/wav',
56. 'wma' => 'audio/x-ms-wma',
57. // video
58. 'avi' => 'video/x-msvideo',
59. 'dv' => 'video/x-dv',
60. 'mp4' => 'video/mp4',
61. 'mpeg' => 'video/mpeg',
62. 'mpg' => 'video/mpeg',
63. 'mov' => 'video/quicktime',
64. 'wm' => 'video/x-ms-wmv',
65. 'flv' => 'video/x-flv',
66. 'mkv' => 'video/x-matroska'
67. );
68. function _getMimeDetect() {
69. if (class_exists('finfo')) {
70. return 'finfo';
71. } else if (function_exists('mime_content_type')) {
72. return 'mime_content_type';
73. } else if ( function_exists('exec')) {
74. $result = exec('file -ib '.escapeshellarg(__FILE__));
75. if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
76. return 'linux';
77. }
78. $result = exec('file -Ib '.escapeshellarg(__FILE__));
79. if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
80. return 'bsd';
81. }
82. }
83. return 'internal';
84. }
85. function _getMimeType($path) {
86. global $mime;
87. $fmime = _getMimeDetect();
88. switch($fmime) {
89. case 'finfo':
90. $finfo = finfo_open(FILEINFO_MIME);
91. if ($finfo)
92. $type = @finfo_file($finfo, $path);
93. break;
94. case 'mime_content_type':
95. $type = mime_content_type($path);
96. break;
97. case 'linux':
98. $type = exec('file -ib '.escapeshellarg($path));
99. break;
100. case 'bsd':
101. $type = exec('file -Ib '.escapeshellarg($path));
102. break;
103. default:
104. $pinfo = pathinfo($path);
105. $ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
106. $type = isset($mime[$ext]) ? $mime[$ext] : 'unkown';
107. break;
108. }
109. $type = explode(';', $type);
110. //需要加上这段，因为如果使用mime_content_type函数来获取一个不存在的$path时会返回'application/octet-stream'
111. if ($fmime != 'internal' AND $type[0] == 'application/octet-stream') {
112. $pinfo = pathinfo($path);
113. $ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
114. if (!emptyempty($ext) AND !emptyempty($mime[$ext])) {
115. $type[0] = $mime[$ext];
116. }
117. }
118. return $type[0];
119. }
120. $path = '1.txt'; //实际上当前路径并不存在1.txt
121. var_dump(_getMimeType($path));
122. /*End of php*/