PHP: Detect mime type by extension

Source code viewer
// composer require symfony/mime
 
use Symfony\Component\Mime\MimeTypes;
 
// Function to detect MIME type by file extension
function getMimeType($fileName) {
    $mimeTypes = new MimeTypes();
 
    // Get MIME types based on file extension
    // - `getMimeTypes()` takes a file extension and returns an array of MIME types for it.
    // - `[0]` gets the primary MIME type if multiple are possible for a given extension.
    // - If no match is found, it defaults to 'application/octet-stream'.
    return $mimeTypes->getMimeTypes(pathinfo($fileName, PATHINFO_EXTENSION))[0] ?? 'application/octet-stream';
}
 
// Example usage
$fileName = 'example.png';
$mimeType = getMimeType($fileName);
echo $mimeType; // Outputs: 'image/png'
Programming Language: PHP