Register a Custom Sidebar Widget Area

<?php
if ( ! function_exists( 'scseed_register_custom_sidebar' ) ) {
    function scseed_register_custom_sidebar() {
        register_sidebar( array(
            'name'          => __( 'Custom Widget Area', 'scseed' ),
            'id'            => 'scseed-custom-sidebar',
            'description'   => __( 'Add widgets here to display them in the custom widget zone.', 'scseed' ),
            'before_widget' => '<section id="%1$s" class="widget %2$s">',
            'after_widget'  => '</section>',
            'before_title'  => '<h2 class="widget-title">',
            'after_title'   => '</h2>',
        ) );
    }
}
add_action( 'widgets_init', 'scseed_register_custom_sidebar' );