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How can I create parent category or child category using html and assign it to parent category if exists otherwise create new category as parent and assign it to my custom post type.

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wp_create_category( $cat_name, $parent );

using function above getting fetal error

function create_cat_form_submit(){

$cat_name = $_POST['cat_name'];

if(!empty($cat_name) || $cat_name !== ''){

    wp_create_category( $cat_name, '' );

   }    
}

Fatal error: Uncaught Error: Call to undefined function wp_create_category() in E:\xampp\htdocs\post_view_counter\wp-content\plugins\tasks\tasks.php:146 Stack trace: #0 
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Since wp_create_category() is part of the admin API you can only rely it's defined if is_admin() === true. Instead use wp_insert_term(). Check the examples in the codex.

  • thanks Zlatev, lovely answer, if you please provide me example as per my code situation, that will be great, if there is any hook involve please also mention that thanks – mohsin Sep 21 '17 at 13:33

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