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Add hierarchy option to posts

If you need to have a parent option for any post custom post to organize inside the admin menu or to loop all child post for some post id just add this code snippet to functions.php

Page attributes options example
<?php

add_filter( 'register_post_type_args', 'add_hierarchy_support', 10, 2 );
function add_hierarchy_support( $args, $post_type ){

    if ($post_type === 'post' || $post_type === 'docs') { // <-- enter desired post type here

        $args['hierarchical'] = true;
        $args['supports'] = array_merge($args['supports'], array ('page-attributes') );
    }

    return $args;
}

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