如何确定与 PHP 中的 MIME 类型关联的扩展名？
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How do I determine the extension(s) associated with a MIME type in PHP?
提问by Alexander Trauzzi
Is there a quick and dirty mapping of MIME types to extensions in PHP that I can make use of?
是否有我可以使用的 MIME 类型到 PHP 扩展的快速而肮脏的映射？
采纳答案by chaos
Not built-in, but it's not terribly hard to roll your own:
不是内置的，但推出自己的并不难：
function system_extension_mime_types() {
# Returns the system MIME type mapping of extensions to MIME types, as defined in /etc/mime.types.
$out = array();
$file = fopen('/etc/mime.types', 'r');
while(($line = fgets($file)) !== false) {
$line = trim(preg_replace('/#.*/', '', $line));
if(!$line)
continue;
$parts = preg_split('/\s+/', $line);
if(count($parts) == 1)
continue;
$type = array_shift($parts);
foreach($parts as $part)
$out[$part] = $type;
}
fclose($file);
return $out;
}
function system_extension_mime_type($file) {
# Returns the system MIME type (as defined in /etc/mime.types) for the filename specified.
#
# $file - the filename to examine
static $types;
if(!isset($types))
$types = system_extension_mime_types();
$ext = pathinfo($file, PATHINFO_EXTENSION);
if(!$ext)
$ext = $file;
$ext = strtolower($ext);
return isset($types[$ext]) ? $types[$ext] : null;
}
function system_mime_type_extensions() {
# Returns the system MIME type mapping of MIME types to extensions, as defined in /etc/mime.types (considering the first
# extension listed to be canonical).
$out = array();
$file = fopen('/etc/mime.types', 'r');
while(($line = fgets($file)) !== false) {
$line = trim(preg_replace('/#.*/', '', $line));
if(!$line)
continue;
$parts = preg_split('/\s+/', $line);
if(count($parts) == 1)
continue;
$type = array_shift($parts);
if(!isset($out[$type]))
$out[$type] = array_shift($parts);
}
fclose($file);
return $out;
}
function system_mime_type_extension($type) {
# Returns the canonical file extension for the MIME type specified, as defined in /etc/mime.types (considering the first
# extension listed to be canonical).
#
# $type - the MIME type
static $exts;
if(!isset($exts))
$exts = system_mime_type_extensions();
return isset($exts[$type]) ? $exts[$type] : null;
}
回答by Jorge Barata
You could use mime_content_typebut it is deprecated. Use fileinfoinstead:
你可以使用，mime_content_type但它已被弃用。使用fileinfo来代替：
function getMimeType($filename) {
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mime = finfo_file($finfo, $filename);
finfo_close($finfo);
return $mime;
}
回答by Rob
You might want to use this library: https://github.com/ralouphie/mimey
你可能想使用这个库：https: //github.com/ralouphie/mimey
Example usage:
用法示例：
$mimes = new \Mimey\MimeTypes;
// Convert extension to MIME type:
$mimes->getMimeType('json'); // application/json
// Convert MIME type to extension:
$mimes->getExtension('application/json'); // json
This because apparently the quality of the provided PHP functions is dubious.
这是因为显然提供的 PHP 函数的质量值得怀疑。
回答by Foreever
If you are working with vary limited extensions of images and need something very simple, I think this is enough.
如果您正在使用各种有限的图像扩展并且需要一些非常简单的东西，我认为这已经足够了。
switch($info['mime'])
{
case 'image/gif' : $extension = 'gif'; break;
case 'image/png' : $extension = 'png'; break;
case 'image/jpeg' : $extension = 'jpg'; break;
default :
throw new ApplicationException('The file uploaded was not a valid image file.');
break;
}
回答by MSS
use this file : https://github.com/ralouphie/mimey/blob/develop/mime.types.php
使用这个文件：https: //github.com/ralouphie/mimey/blob/develop/mime.types.php
like this :
像这样 ：
$mimes=include('mime.types.php');
or copy content:
或复制内容：
$mime= array (
'mimes' =>
array (
'ez' =>
array (
0 => 'application/andrew-inset',
),
'aw' =>
array (
0 => 'application/applixware',
),
'atom' =>
array (
0 => 'application/atom+xml',
),
'atomcat' =>
array (
0 => 'application/atomcat+xml',
)
...
and an example of getting from a stream:
以及从流中获取的示例：
$finfo = new \finfo(FILEINFO_MIME_TYPE);
$mime=$finfo->buffer($data);
$mimes=include(__DIR__."/mime.types.php");
echo ($mime); //mime
echo ($mimes['extensions'][$mime]); // file extension
