fileinfo

The Fileinfo extension in PHP provides functions to determine the type of a file based on its content rather than its extension.

The Fileinfo extension in PHP provides functions to determine the type of a file based on its content rather than its extension. This extension is included by default, but it must be enabled in the `php.ini` file. To activate it, uncomment the line `;extension=fileinfo` by removing the semicolon, and then restart your web server.

Already included with PHP.