[WordPress] アップロードできるファイル種類を制限する

function my_mime_types($mime_types){
    //Creating a new array will reset the allowed filetypes
    $mime_types = array(
        'jpg|jpeg|jpe' => 'image/jpeg',
        'gif' => 'image/gif',
        'png' => 'image/png',
        'bmp' => 'image/bmp',
        'tif|tiff' => 'image/tiff',
    );
    return $mime_types;
}
add_filter('upload_mimes', 'my_mime_types', 1, 1);

via. Adding & Removing Allowed FileTypes To WordPress Media Library | NetWebLogic