wordpress - Have pre defined menus when developing a theme -

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i trying develop theme customizable menus, header menu options , footer menu options.

in theme menu page right now, in "select menu edit" there 2 menus editable , because manually added 2nd menu. in theme trying make similar to, there tons of pre made menus in "select menu edit" , did not add of those.

how can add pre defined selectable menu options theme?

like footer have 4 different parts, header have part etc..

i want more menus here

i want more menus here

enter image description here

i know how add more here!

to create new menu location , menu, add code functions.php file:

add_action( 'after_setup_theme', 'register_my_menu' ); function register_my_menu() {   register_nav_menu( 'header_menu', 'menu header' );   // change desired menu name   $menu_header = wp_create_nav_menu('main menu');   if($menu_header > 0) {       // set new menu location       set_theme_mod( 'nav_menu_locations' , array( 'header_menu' => $menu_header ) );   } }

it register new menu location, create blank menu inside it. if need add items inside menu, check on wp_update_nav_menu_item function.

then display in template (like header.php in case) :

<?php wp_nav_menu( array('menu' => 'header_menu' )); ?>

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