WP delete full-size image

https://wordpress.stackexchange.com/questions/17719/delete-the-original-big-size-image-after-upload-and-leave-only-3-images-crunched

TODO update to post have optimize, lighthouse perf and other SEO audit tool.

add_filter( 'wp_generate_attachment_metadata', 'delete_fullsize_image' );
function delete_fullsize_image( $metadata )
{
    $upload_dir = wp_upload_dir();
    $full_image_path = trailingslashit( $upload_dir['basedir'] ) . $metadata['file'];
    $deleted = unlink( $full_image_path );

    return $metadata;
}