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Load scripts and styles only on specific WordPress admin pages to avoid conflicts and keep the dashboard fast. For more on optimizing script loading.

add_action( 'admin_enqueue_scripts', function ( $hook ) {
    // Only load on the post edit screen
    if ( $hook !== 'post.php' && $hook !== 'post-new.php' ) {
        return;
    }

    wp_enqueue_style(
        'savvy-admin-custom',
        get_template_directory_uri() . '/css/admin-custom.css',
        array(),
        '1.0.0'
    );

    wp_enqueue_script(
        'savvy-admin-custom',
        get_template_directory_uri() . '/js/admin-custom.js',
        array( 'jquery' ),
        '1.0.0',
        true
    );
} );

Add to functions.php. The $hook parameter tells you which admin page is loading. Common values: post.php, edit.php, upload.php, options-general.php.

Add a custom option to the bulk actions dropdown on the posts list screen. This example marks selected posts as “Featured”. For more on WordPress hooks.

add_filter( 'bulk_actions-edit-post', function ( $actions ) {
    $actions['mark_featured'] = 'Mark as Featured';
    return $actions;
} );

add_filter( 'handle_bulk_actions-edit-post', function ( $redirect_to, $action, $post_ids ) {
    if ( $action !== 'mark_featured' ) {
        return $redirect_to;
    }

    foreach ( $post_ids as $post_id ) {
        update_post_meta( $post_id, '_is_featured', '1' );
    }

    return add_query_arg( 'marked_featured', count( $post_ids ), $redirect_to );
}, 10, 3 );

add_action( 'admin_notices', function () {
    if ( empty( $_REQUEST['marked_featured'] ) ) {
        return;
    }

    $count = intval( $_REQUEST['marked_featured'] );
    printf(
        '<div class="notice notice-success is-dismissible"><p>%d post(s) marked as featured.</p></div>',
        $count
    );
} );

Add to functions.php. Change mark_featured and the meta key to fit your use case.

Create a reusable shortcode that accepts attributes. This pattern is the foundation for any custom shortcode in WordPress. For more on WordPress hooks.

function savvy_button_shortcode( $atts ) {
    $atts = shortcode_atts( array(
        'url'   => '#',
        'text'  => 'Click Here',
        'color' => 'blue',
    ), $atts, 'savvy_button' );

    return sprintf(
        '<a href="%s" class="savvy-btn savvy-btn-%s">%s</a>',
        esc_url( $atts['url'] ),
        esc_attr( $atts['color'] ),
        esc_html( $atts['text'] )
    );
}

add_shortcode( 'savvy_button', 'savvy_button_shortcode' );

Add to functions.php. Usage: [savvy_button url="/contact/" text="Contact Us" color="gold"].

Register a custom REST API endpoint to expose data from your theme or plugin. For more on securing the REST API.

add_action( 'rest_api_init', function () {
    register_rest_route( 'savvy/v1', '/recent-posts/', array(
        'methods'             => 'GET',
        'callback'            => 'savvy_get_recent_posts',
        'permission_callback' => '__return_true',
    ) );
} );

function savvy_get_recent_posts() {
    $posts = get_posts( array(
        'numberposts' => 5,
        'post_status' => 'publish',
    ) );

    $data = array();
    foreach ( $posts as $post ) {
        $data[] = array(
            'id'    => $post->ID,
            'title' => $post->post_title,
            'link'  => get_permalink( $post ),
        );
    }

    return rest_ensure_response( $data );
}

Add to functions.php. Access at /wp-json/savvy/v1/recent-posts/. Set permission_callback to restrict access if needed.

Display custom notices in the WordPress admin dashboard. Useful for warnings, reminders, or success messages for your team. For more on WordPress hooks.

add_action( 'admin_notices', function () {
    $screen = get_current_screen();

    if ( $screen->id !== 'edit-post' ) {
        return;
    }

    echo '<div class="notice notice-warning is-dismissible">';
    echo '<p>Remember to set a featured image before publishing.</p>';
    echo '</div>';
} );

Add to functions.php. Change the $screen->id check and message text to fit your needs. Use notice-success, notice-error, or notice-info for other styles.

Over time, expired transients pile up in the wp_options table and slow down queries. This snippet schedules a weekly cleanup. For more on improving WordPress performance.

if ( ! wp_next_scheduled( 'savvy_cleanup_transients' ) ) {
    wp_schedule_event( time(), 'weekly', 'savvy_cleanup_transients' );
}

add_action( 'savvy_cleanup_transients', function () {
    global $wpdb;
    $wpdb->query(
        "DELETE a, b FROM {$wpdb->options} a
        LEFT JOIN {$wpdb->options} b
            ON b.option_name = REPLACE( a.option_name, '_transient_timeout_', '_transient_' )
        WHERE a.option_name LIKE '\_transient\_timeout\_%'
            AND a.option_value < UNIX_TIMESTAMP()"
    );
} );

Add to functions.php. The cron runs once a week and removes only expired transients.

WordPress loads jQuery Migrate for backward compatibility. If your site and plugins support modern jQuery, you can remove Migrate and save an HTTP request. Add to your functions.php file. For more on performance optimization.

add_action( 'wp_default_scripts', function( $scripts ) {
	if ( ! is_admin() && isset( $scripts->registered['jquery'] ) ) {
		$script = $scripts->registered['jquery'];
		if ( $script->deps ) {
			$script->deps = array_diff( $script->deps, array( 'jquery-migrate' ) );
		}
	}
} );

You can define custom image sizes for your site. Images are generated on upload or when regenerating thumbnails. Add to your functions.php file. For more on image optimization.

add_action( 'after_setup_theme', function() {
	add_image_size( 'card-thumbnail', 400, 300, true );
	add_image_size( 'hero-banner', 1920, 600, true );
} );

Replace names and dimensions as needed. Use true for crop or false for scale.

WordPress defaults to 10 posts per page. You can change this for all archives or a specific one. Add to your functions.php file. For more on adding pagination.

add_action( 'pre_get_posts', function( $query ) {
	if ( ! is_admin() && $query->is_main_query() && $query->is_home() ) {
		$query->set( 'posts_per_page', 12 );
	}
} );

Replace is_home() with is_archive() or is_post_type_archive('your_cpt') as needed.