Add a Custom Sidebar to a WordPress Theme

Add this code into functions.php in order to register your custom sidebar:

function my_custom_sidebar() {
    register_sidebar(
        array (
            'name' => __( 'Custom', 'your-theme-domain' ),
            'id' => 'custom-side-bar',
            'description' => __( 'Custom Sidebar', 'your-theme-domain' ),
            'before_widget' => '<div class="widget-content">',
            'after_widget' => "</div>",
            'before_title' => '<h3 class="widget-title">',
            'after_title' => '</h3>',
        )
    );
}
add_action( 'widgets_init', 'my_custom_sidebar' );

 

If you want to add sidebar for the specific pages add this code to that page template.

<?php if ( is_active_sidebar( 'custom-side-bar' ) ) : ?>
    <?php dynamic_sidebar( 'custom-side-bar' ); ?>
<?php endif; ?>