Last 7 Days Compared Widget

add_action( 'wp_dashboard_setup', function () {
    wp_add_dashboard_widget( 'wpide_last_7_days', 'Last 7 days', function () {
        global $wpdb;

        $stats = get_transient( 'wpide_last_7_days' );
        if ( false === $stats ) {
            $now   = time();
            $week  = gmdate( 'Y-m-d H:i:s', $now - WEEK_IN_SECONDS );
            $two   = gmdate( 'Y-m-d H:i:s', $now - 2 * WEEK_IN_SECONDS );
            $pair  = function ( $sql ) use ( $wpdb, $week, $two ) {
                return array_map( 'intval', (array) $wpdb->get_row( $wpdb->prepare( $sql, $week, $week, $two ), ARRAY_N ) );
            };
            $stats = array(
                'Posts'    => $pair( "SELECT SUM( post_date_gmt >= %s ), SUM( post_date_gmt < %s ) FROM {$wpdb->posts} WHERE post_type = 'post' AND post_status = 'publish' AND post_date_gmt >= %s" ),
                'Comments' => $pair( "SELECT SUM( comment_date_gmt >= %s ), SUM( comment_date_gmt < %s ) FROM {$wpdb->comments} WHERE comment_approved = '1' AND comment_date_gmt >= %s" ),
                'Users'    => $pair( "SELECT SUM( user_registered >= %s ), SUM( user_registered < %s ) FROM {$wpdb->users} WHERE user_registered >= %s" ),
            );
            set_transient( 'wpide_last_7_days', $stats, HOUR_IN_SECONDS );
        }

        echo '<div style="display:grid;grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:12px">';
        foreach ( $stats as $label => $values ) {
            list( $current, $previous ) = array_pad( $values, 2, 0 );
            $diff  = $current - $previous;
            $arrow = $diff > 0 ? '▲' : ( $diff < 0 ? '▼' : '—' );
            $color = $diff > 0 ? '#00a32a' : ( $diff < 0 ? '#d63638' : '#646970' );
            printf(
                '<div style="border:1px solid #dcdcde;border-radius:4px;padding:10px;text-align:center"><div style="font-size:24px;font-weight:600">%d</div><div>%s</div><div style="color:%s;font-size:12px"><span aria-hidden="true">%s</span> %s vs previous week (%d)</div></div>',
                (int) $current,
                esc_html( $label ),
                esc_attr( $color ),
                $arrow,
                esc_html( ( $diff > 0 ? '+' : '' ) . $diff ),
                (int) $previous
            );
        }
        echo '</div>';
    } );
} );