How to Identify MP3s and Images Without Extension Checks?

Identify File Format: distinguishing MP3s and Images without extension checks

The standard approach to determining a file's type involves scanning through its possible extensions. However, this method can be tedious and inefficient. This question seeks an alternative solution to ascertain whether a file is an MP3 or an image without relying on extension checks.

The solution lies in harnessing native language capabilities. For PHP versions below 5.3, the function mime_content_type() can provide the file's MIME type. From PHP 5.3 onwards, finfo_fopen() takes over this task.

Alternatives such as exif_imagetype and getimagesize also exist, but their functionality is limited to identifying image file types. If a comprehensive MIME type analysis is required, the following code snippet offers a neat solution:

function getMimeType($filename)
{
    $mimetype = false;
    if(function_exists('finfo_fopen')) {
        // open with FileInfo
    } elseif(function_exists('getimagesize')) {
        // open with GD
    } elseif(function_exists('exif_imagetype')) {
       // open with EXIF
    } elseif(function_exists('mime_content_type')) {
       $mimetype = mime_content_type($filename);
    }
    return $mimetype;
}

This proxy function effectively delegates the task to the available detector on your system, ensuring a robust and efficient file format identification process.

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