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Two sidebars

// Register Sidebars
function w3_init_sidebars() {

	$args = array(
		'id'            => 'left_sidebar',
		'name'          => __( 'Left Sidebar', 'zaibserver' ),
		'description'   => __( 'Barra lateral esquerda', 'zaibserver' ),
		'before_title'  => '<h2 class="h2-left-sidebar">',
		'after_title'   => '</h2>',
		'before_widget' => '<li>',
		'after_widget'  => '</li>',
	);
	register_sidebar( $args );

	$args = array(
		'id'            => 'right_sidebar',
		'name'          => __( 'Right Sidebar', 'zaibserver' ),
		'description'   => __( 'Barra lateral direita', 'zaibserver' ),
		'before_title'  => '<h2 class="h2-right-sidebar">',
		'after_title'   => '</h2>',
		'before_widget' => '<li>',
		'after_widget'  => '</li>',
	);
	register_sidebar( $args );

}
add_action( 'widgets_init', 'w3_init_sidebars' );