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：





&#65279;<?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。