php准确获取文件MIME类型的方法
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';
}elseif(function_exists('mime_content_type')){
return'mime_content_type';
}elseif(function_exists('exec')){
$result=exec('file-ib'.escapeshellarg(__FILE__));
if(0===strpos($result,'text/x-php')OR0===strpos($result,'text/x-c++')){
return'linux';
}
$result=exec('file-Ib'.escapeshellarg(__FILE__));
if(0===strpos($result,'text/x-php')OR0===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));
/*Endofphp*/
希望本文所述对大家的php程序设计有所帮助。