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<?php

// Conditionally change menus
add_filter( 'wp_nav_menu_args', 'bb_wp_nav_menu_args' );
function bb_wp_nav_menu_args( $args = '' ) {
	// change the menu in the Header menu position
	if( $args['theme_location'] == 'header' && is_page('1159') ) { 
		$args['menu'] = '32'; // 32 is the ID of the menu we want to use here
	}
	return $args;
}