Symfony version(s) affected

v6.3.0

Description

The mime type map included in \Symfony\Component\Mime\MimeTypes is missing text/x-php, which is associated with PHP files, which prevents the MimeTypes::getDefault()->getExtensions() method from returning the valid extension for these files.

How to reproduce

1. Create a simple PHP file:

   $ cat phpinfo.php
   <?php
   phpinfo();
   

2. Confirm the filesystem can identify the mimetype:

   $ file -b --mime -- phpinfo.php
   text/x-php; charset=us-ascii
   

3. Detect the mime and try to retrieve the extension with Symfony:

   use \Symfony\Component\Mime\MimeTypes;
   
   $mime = MimeTypes::getDefault()->guessMimeType('phpinfo.php');
   echo "Mime => {$mime}".PHP_EOL; 
   
   $extensions = MimeTypes::getDefault()->getExtensions($mime);
   echo "Extensions => ".implode(', ', $extensions);
   

   Mime => text/x-php
   Extensions => 
   

Possible Solution

The mapping of text/x-php => .php should be added to allow for proper detection of these files.

Additional Context

The Resources/bin/update_mime_types.php file suggests this might be a problem upstream, or something that can be hardcoded within that script? I'm not familiar with the mechanics of the mime type mapping, so I thought it best to report the issue directly here and seek further instructions. Please let me know if I need to report the issue elsewhere.