[Register Sidebar]

functions.php

function wpb_widgets_init() {
 
    register_sidebar( array(
        'name' => __( 'Main Sidebar', 'wpb' ),
        'id' => 'sidebar-1',
        'description' => __( 'The main sidebar appears on the right on each page except the front page template', 'wpb' ),
        'before_widget' => '<aside id="%1$s" class="widget %2$s">',
        'after_widget' => '</aside>',
        'before_title' => '<h3 class="widget-title">',
        'after_title' => '</h3>',
    ) );
 
    register_sidebar( array(
        'name' =>__( 'Front page sidebar', 'wpb'),
        'id' => 'sidebar-2',
        'description' => __( 'Appears on the static front page template', 'wpb' ),
        'before_widget' => '<aside id="%1$s" class="widget %2$s">',
        'after_widget' => '</aside>',
        'before_title' => '<h3 class="widget-title">',
        'after_title' => '</h3>',
    ) );
    }
 
add_action( 'widgets_init', 'wpb_widgets_init' );

PHPfile.php

<?php if ( is_active_sidebar( 'sidebar-1' ) ) : ?>
    <div id="secondary" class="widget-area" role="complementary">
    <?php dynamic_sidebar( 'sidebar-1' ); ?>
    </div>
<?php endif; ?>