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php准确获取文件MIME类型的方法

2015-06-17 15:44 801 查看

本文实例讲述了php准确获取文件MIME类型的方法。分享给大家供大家参考。具体实现方法如下：

<?php
$mime = array (
//applications
'ai'  => 'application/postscript',
'eps'  => 'application/postscript',
'exe'  => 'application/octet-stream',
'doc'  => 'application/vnd.ms-word',
'xls'  => 'application/vnd.ms-excel',
'ppt'  => 'application/vnd.ms-powerpoint',
'pps'  => 'application/vnd.ms-powerpoint',
'pdf'  => 'application/pdf',
'xml'  => 'application/xml',
'odt'  => 'application/vnd.oasis.opendocument.text',
'swf'  => 'application/x-shockwave-flash',
// archives
'gz'  => 'application/x-gzip',
'tgz'  => 'application/x-gzip',
'bz'  => 'application/x-bzip2',
'bz2'  => 'application/x-bzip2',
'tbz'  => 'application/x-bzip2',
'zip'  => 'application/zip',
'rar'  => 'application/x-rar',
'tar'  => 'application/x-tar',
'7z'  => 'application/x-7z-compressed',
// texts
'txt'  => 'text/plain',
'php'  => 'text/x-php',
'html' => 'text/html',
'htm'  => 'text/html',
'js'  => 'text/javascript',
'css'  => 'text/css',
'rtf'  => 'text/rtf',
'rtfd' => 'text/rtfd',
'py'  => 'text/x-python',
'java' => 'text/x-java-source',
'rb'  => 'text/x-ruby',
'sh'  => 'text/x-shellscript',
'pl'  => 'text/x-perl',
'sql'  => 'text/x-sql',
// images
'bmp'  => 'image/x-ms-bmp',
'jpg'  => 'image/jpeg',
'jpeg' => 'image/jpeg',
'gif'  => 'image/gif',
'png'  => 'image/png',
'tif'  => 'image/tiff',
'tiff' => 'image/tiff',
'tga'  => 'image/x-targa',
'psd'  => 'image/vnd.adobe.photoshop',
//audio
'mp3'  => 'audio/mpeg',
'mid'  => 'audio/midi',
'ogg'  => 'audio/ogg',
'mp4a' => 'audio/mp4',
'wav'  => 'audio/wav',
'wma'  => 'audio/x-ms-wma',
// video
'avi'  => 'video/x-msvideo',
'dv'  => 'video/x-dv',
'mp4'  => 'video/mp4',
'mpeg' => 'video/mpeg',
'mpg'  => 'video/mpeg',
'mov'  => 'video/quicktime',
'wm'  => 'video/x-ms-wmv',
'flv'  => 'video/x-flv',
'mkv'  => 'video/x-matroska'
);
function _getMimeDetect() {
if (class_exists('finfo')) {
return 'finfo';
} else if (function_exists('mime_content_type')) {
return 'mime_content_type';
} else if ( function_exists('exec')) {
$result = exec('file -ib '.escapeshellarg(__FILE__));
if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
return 'linux';
}
$result = exec('file -Ib '.escapeshellarg(__FILE__));
if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {
return 'bsd';
}
}
return 'internal';
}
function _getMimeType($path) {
global $mime;
$fmime = _getMimeDetect();
switch($fmime) {
case 'finfo':
$finfo = finfo_open(FILEINFO_MIME);
if ($finfo)
$type = @finfo_file($finfo, $path);
break;
case 'mime_content_type':
$type = mime_content_type($path);
break;
case 'linux':
$type = exec('file -ib '.escapeshellarg($path));
break;
case 'bsd':
$type = exec('file -Ib '.escapeshellarg($path));
break;
default:
$pinfo = pathinfo($path);
$ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
$type = isset($mime[$ext]) ? $mime[$ext] : 'unkown';
break;
}
$type = explode(';', $type);
//需要加上这段，因为如果使用mime_content_type函数来获取一个不存在的$path时会返回'application/octet-stream'
if ($fmime != 'internal' AND $type[0] == 'application/octet-stream') {
$pinfo = pathinfo($path);
$ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';
if (!empty($ext) AND !empty($mime[$ext])) {
$type[0] = $mime[$ext];
}
}
return $type[0];
}
$path = '1.txt'; //实际上当前路径并不存在1.txt
var_dump(_getMimeType($path));
/*End of php*/

希望本文所述对大家的php程序设计有所帮助。

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