get_avatar() - Simple Local Avatars

    public function get_avatar( $avatar = '', $id_or_email, $size = 96, $default = '', $alt = '' ) {
        if ( is_numeric( $id_or_email ) )
            $user_id = (int) $id_or_email;
        elseif ( is_string( $id_or_email ) && ( $user = get_user_by( 'email', $id_or_email ) ) )
            $user_id = $user->ID;
        elseif ( is_object( $id_or_email ) && ! empty( $id_or_email->user_id ) )
            $user_id = (int) $id_or_email->user_id;

        if ( empty( $user_id ) )
            return $avatar;

        // fetch local avatar from meta and make sure it's properly ste
        $local_avatars = get_user_meta( $user_id, 'simple_local_avatar', true );
        if ( empty( $local_avatars['full'] ) )
            return $avatar;

        // check rating
        $avatar_rating = get_user_meta( $user_id, 'simple_local_avatar_rating', true );
        if ( ! empty( $avatar_rating ) && 'G' != $avatar_rating && ( $site_rating = get_option( 'avatar_rating' ) ) ) {
            $ratings = array_keys( $this->avatar_ratings );
            $site_rating_weight = array_search( $site_rating, $ratings );
            $avatar_rating_weight = array_search( $avatar_rating, $ratings );
            if ( false !== $avatar_rating_weight && $avatar_rating_weight > $site_rating_weight )
                return $avatar;
        }

        // handle "real" media
        if ( ! empty( $local_avatars['media_id'] ) ) {
            // has the media been deleted?
            if ( ! $avatar_full_path = get_attached_file( $local_avatars['media_id'] ) ) {
                // only allowed logged in users to delete bad data to mitigate performance issues
                if ( is_user_logged_in() )
                    $this->avatar_delete( $user_id );

                return $avatar;
            }
        }

        $size = (int) $size;

        if ( empty( $alt ) )
            $alt = get_the_author_meta( 'display_name', $user_id );

        // generate a new size
        if ( ! array_key_exists( $size, $local_avatars ) ) {
            $local_avatars[$size] = $local_avatars['full']; // just in case of failure elsewhere

            // allow automatic rescaling to be turned off
            if ( $allow_dynamic_resizing = apply_filters( 'simple_local_avatars_dynamic_resize', true ) ) :

                $upload_path = wp_upload_dir();

                // get path for image by converting URL, unless its already been set, thanks to using media library approach
                if ( ! isset( $avatar_full_path ) )
                    $avatar_full_path = str_replace( $upload_path['baseurl'], $upload_path['basedir'], $local_avatars['full'] );

                // generate the new size
                $editor = wp_get_image_editor( $avatar_full_path );
                if ( ! is_wp_error( $editor ) ) {
                    $resized = $editor->resize( $size, $size, true );
                    if ( ! is_wp_error( $resized ) ) {
                        $dest_file = $editor->generate_filename();
                        $saved = $editor->save( $dest_file );
                        if ( ! is_wp_error( $saved ) )
                            $local_avatars[$size] = str_replace( $upload_path['basedir'], $upload_path['baseurl'], $dest_file );
                    }
                }

                // save updated avatar sizes
                update_user_meta( $user_id, 'simple_local_avatar', $local_avatars );

            endif;
        }

        if ( 'http' != substr( $local_avatars[$size], 0, 4 ) )
            $local_avatars[$size] = home_url( $local_avatars[$size] );

        $author_class = is_author( $user_id ) ? ' current-author' : '' ;
        $avatar = "<img alt='" . esc_attr( $alt ) . "' src='" . esc_url( $local_avatars[$size] ) . "' class='avatar avatar-{$size}{$author_class} photo' height='{$size}' width='{$size}' />";

        return apply_filters( 'simple_local_avatar', $avatar );
    }