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wp_insert_category() Function WordPress Developer ...

    https://developer.wordpress.org/reference/functions/wp_insert_category/
    //Define the category $wpdocs_cat = array('cat_name' => 'Wpdocs Category', 'category_description' => 'A Cool Category', 'category_nicename' => 'category-slug', 'category_parent' => ''); // Create the category $wpdocs_cat_id = wp_insert_category($wpdocs_cat);

wp query - WP_Query by Category Name - WordPress ...

    https://wordpress.stackexchange.com/questions/161071/wp-query-by-category-name
    cat (int) - use category id. category_name (string)- use category slug (NOT name). category__and (array) - use category id. category__in (array) - use category id. category__not_in (array) - use category id. You can use either use cat or category_name. If you are uncertain of any parameter, just do a var_dump() of your new WP_Query variable. In your case, do the following

WP_Query Class WordPress Developer Resources

    https://developer.wordpress.org/reference/classes/wp_query/
    $query = new WP_Query( array( 'cat' => '2,6,17,38' ) ); Display posts that have these categories, using category slug: $query = new WP_Query( array( 'category_name' => 'staff,news' ) ); Display posts that have “all” of these categories: $query = new WP_Query( array( 'category_name' => 'staff+news' ) );

category_exists() Function WordPress Developer Resources

    https://developer.wordpress.org/reference/functions/category_exists/
    function category_exists( $cat_name, $parent = null ) { $id = term_exists( $cat_name, 'category', $parent ); if ( is_array( $id ) ) { $id = $id['term_id']; } return $id; }

wordpress - how to query_posts by category slug - Stack ...

    https://stackoverflow.com/questions/19792479/how-to-query-posts-by-category-slug
    tax_query is used to get the posts associated with certain taxonomy. {tax} (string) - use taxonomy slug.Deprecated as of Version 3.1 in favor of 'tax_query'.; tax_query (array) - use taxonomy parameters (available with Version 3.1).. taxonomy (string) - Taxonomy.; field (string) - Select taxonomy term by ('id' or 'slug') ; terms (int/string/array) - Taxonomy term(s).
    [CATITEMSBL#1]

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