PHP package for converting file extensions to MIME types and vice versa.

4.0.7 2023-12-16 17:08 UTC

This package is auto-updated.

Last update: 2024-05-01 10:27:29 UTC


PHP package for converting file extensions to MIME types and vice versa.

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This package uses httpd's mime.types to generate a mapping of file extension to MIME type and the other way around. Click here to view the changelog from their svn: changelog

The mime.types file is parsed by bin/generate.php and converted into an optimized JSON object in dist/mime.types.min.json which is then wrapped by helper class MimeTypes.

Since 3.1.0: also provides a generated PHP enum with all mime types and methods to get the extension. Can also be used to get the enum value from an extension.


$mimes = new MimeTypes;

// Convert extension to MIME type:
$mimes->getMimeType('json'); // application/json

// Convert MIME type to extension:
$mimes->getExtension('application/json'); // json

Using the enum

$json = MimeType::ApplicationJson;
echo $json->getExtension(); // json
echo $json->value; // application/json

$html = MimeType::fromExtension('html');
echo $html->value; // text/html

MimeType::fromExtension('asdf'); // throws an InvalidArgumentException if the extension cannot be found

Getting All

It's rare, but some extensions have multiple MIME types:

// Get all MIME types for an extension:
$mimes->getAllMimeTypes('wmz'); // array('application/x-ms-wmz', 'application/x-msmetafile')

However, there are many MIME types that have multiple extensions:

// Get all extensions for a MIME type:
$mimes->getAllExtensions('image/jpeg'); // array('jpeg', 'jpg', 'jpe')

Custom Conversions

You can add custom conversions by changing the mapping that is given to MimeTypes.

There is a MimeMappingBuilder that can help with this:

// Create a builder using the built-in conversions as the basis.
$builder = MimeMappingBuilder::create();

// Add a conversion. This conversion will take precedence over existing ones.
$builder->add('custom/mime-type', 'myextension');

$mimes = new MimeTypes($builder->getMapping());
$mimes->getMimeType('myextension'); // custom/mime-type
$mimes->getExtension('custom/mime-type'); // myextension

You can add as many conversions as you would like to the builder:

$builder->add('custom/mime-type', 'myextension');
$builder->add('foo/bar', 'foobar');
$builder->add('foo/bar', 'fbar');
$builder->add('baz/qux', 'qux');
$builder->add('cat/qux', 'qux');

Optimized Custom Conversion Loading

You can optimize the loading of custom conversions by saving all conversions to a compiled PHP file as part of a build step.

// Add a bunch of custom conversions.
// Save the conversions to a cached file.

The file can then be loaded to avoid overhead of repeated $builder->add(...) calls:

// Load the conversions from a cached file.
$builder = MimeMappingBuilder::load($cache_file_path);
$mimes = new MimeTypes($builder->getMapping());


Compatible with PHP >= 8.1.

composer require elephox/mimey


Missing a MIME type?

Open an issue or even add it yourself! The process is very easy:

  1. fork this repository
  2. add your MIME type to the data/mime.types.custom file (make sure it's properly formatted!)
  3. push your changes
  4. submit a pull request

After a short review and merge, the MIME type will automagically be added to the library.

If you want to, you can also run composer generate-types and add the changed files under dist/ to your PR.


This fork uses the same license as the original repository (MIT). This repository is a fork of ralouphie/mimey. Thanks to them and all the contributors!