change slug wordpress code example

Example 1: wordpress change custom post type slug

function add_custom_rewrite_rule() {

    // First, try to load up the rewrite rules. We do this just in case
    // the default permalink structure is being used.
    if( ($current_rules = get_option('rewrite_rules')) ) {

        // Next, iterate through each custom rule adding a new rule
        // that replaces 'movies' with 'films' and give it a higher
        // priority than the existing rule.
        foreach($current_rules as $key => $val) {
            if(strpos($key, 'movies') !== false) {
                add_rewrite_rule(str_ireplace('movies', 'films', $key), $val, 'top');   
            } // end if
        } // end foreach

    } // end if/else

    // ...and we flush the rules
    flush_rewrite_rules();

} // end add_custom_rewrite_rule
add_action('init', 'add_custom_rewrite_rule');

Example 2: wordpress change slug programmatically

// Create post object
$my_post = array(
     'post_title' => 'How to make your diet success',
     'post_name' => '7-ways-to-make-succes-Diet', //This is what set
     'post_content' => 'my content',
     'post_status' => 'publish',
     'post_author' => 1,
     'post_category' => array(8,39)
  );

// Insert the post into the database
$post_id = wp_insert_post( $my_post );

//For updates use this:
wp_update_post([
  "post_name" => "new-slug",
  "ID" => $post_id,
]);