mime_content_type()

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

检测文件的 MIME 类型

说明

返回通过使用magic.mime检测到的文件 MIME 类型。

参数

要检测的文件名。

返回值

返回文件的 MIME 内容类型，例如text/plain或application/octet-stream。或者在失败时返回FALSE。

错误／异常

失败时抛出E_WARNING警告。

范例

mime_content_type()示例

以上例程会输出：

image/gif
text/plain

参见

• finfo_file()别名 finfo_file()
• finfo_buffer()别名 finfo_buffer()

Fast generation of uptodate mime types:

Output:
$mime_types = array(
  '123' => 'application/vnd.lotus-1-2-3',
  '3dml' => 'text/vnd.in3d.3dml',
  '3g2' => 'video/3gpp2',
  '3gp' => 'video/3gpp',
  '7z' => 'application/x-7z-compressed',
  'aab' => 'application/x-authorware-bin',
  'aac' => 'audio/x-aac',
  'aam' => 'application/x-authorware-map',
  'aas' => 'application/x-authorware-seg',
...
Enjoy.

Completing  comment:
0 string 
There is a composer package that will do this:
https://github.com/ralouphie/mimey

to output a human-readable string, like "HTML document text", which can sometimes be useful.
The only drawback is that your scripts will not work on Windows, but is this such a problem? Just about all web hosts use a UNIX.
It is a far better way than just examining the file extension.
using 

should work on most shared linux hosts without errors. It should also work on Windows hosts with msysgit installed.
Lukas V is IMO missing some point. The MIME type of a file may not be corresponding to the file suffix.
Imagine someone would obfuscate some PHP code in a .gif file, the file suffix would be 'GIF' but the MIME would be text/plain or even text/html.
Another example is files fetched via a distant server (wget / fopen / file / fsockopen...). The server can issue an error, i.e. 404 Not Found, wich again is text/html, whatever you save the file to (download_archive.rar).
His provided function should begin by the test of the function existancy like :
function MIMEalternative($file)
{
  if(function_exists('mime_content_type'))
    return mime_content_type($file);
  else
    return ($file);
}
if you use a transparent 'spacer' GIF i've found it needs to be a around 25x25 for it to register as 'image/gif'. otherwise it's read in as 'text/plain'.
For me mime_content_type didn't work in Linux before I added 
mime_magic.magicfile = "/usr/share/magic.mime"
to php.ini (remember to find the correct path to mime.magic)
The correct little correction:
exec will return the mime with a newline at the end, the trim() should be called with the result of exec, not the other way around. 
Here's a simple function to return MIME types, based on the Apache mime.types file. [The one in my previous submission, which has since been replaced by this one] only works properly if mime.types is formatted as Windows text. The updated version below corrects this problem. Thanks to Mike for pointing this out.

Notes:
[1] Requires mime.types file distributed with Apache (normally found at ServerRoot/conf/mime.types). If you are using shared hosting, download the file with the Apache distro and then upload it to a directory on your web server that php has access to.
[2] First param is the filename (required). Second parameter is path to mime.types file (optional; defaults to home/etc/).
[3] Based on MIME types registered with IANA (http://www.iana.org/assignments/media-types/index.html). Recognizes 630 extensions associated with 498 MIME types.
[4] Asserts MIME type based on filename extension. Does not examine the actual file; the file does not even have to exist.
[5] Examples of use:
>> echo get_mime_type('myFile.xml');
>> application/xml
>> echo get_mime_type('myPath/myFile.js');
>> application/javascript
>> echo get_mime_type('myPresentation.ppt');
>> application/vnd.ms-powerpoint
>> echo get_mime_type('http://mySite.com/myPage.php);
>> application/x-httpd-php
>> echo get_mime_type('myPicture.jpg');
>> image/jpeg
>> echo get_mime_type('myMusic.mp3');
>> audio/mpeg
and so on...
To create an associative array containing MIME types, use: 
I also had issues with this function.
The issue was that it would almost always return "text/plain".
echo ini_get('mime_magic.magicfile'); // returns /etc/httpd/conf/magic
I found that I needed the OS' magic.mime file instead.
You can either copy it to the existing location, or update your php.ini, you cannot use ini_set().
[root@blade conf]# mv magic magic.old
[root@blade conf]# cp /usr/share/magic.mime magic
[root@blade conf]# apachectl graceful
Note: you will see that I have gracefully restarted apache to ensure it has taken affect.
Not perfect, but works good enough for me ;)
I added these two lines to my magic.mime file:
0 string \':false;
  }
  return $returned;
}
  $file_name = 'mime-array.php';
  $data = generateUpToDateMimeArray(APACHE_MIME_TYPES_URL);
  
  if ($data != "ERROR")
  {
    $file = fopen($file_name, 'wb') or die("cannot open $file_name\n");
    fwrite($file, $data ) or die("cannot write data\n");
    fclose($file);
    echo "updated";
  }
  else
  {
    echo "faliure";
  }
?>
All you need to do is run it once and in your code you can simply add these two lines:

enjoy
additional to svogal's video files:
'mp4' => 'video/mp4',
what also works:
'mp4' => 'audio/mp4',
Since I enabled the mime_magic extension on my IIS, I also got the error message "invalid magic file, disabled" in my phpinfo. After I add these lines to my php.ini, the message disappeared and it works great!
mime_magic.debug = Off
mime_magic.magicfile ="D:\PHP5\extras\magic.mime"
mime_magic.debug is by default off but without this line it fails. I'm using PHP 5.2.5.
 

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