Title: Developing Plugin: Call to undefined function add_menu_page()
Last modified: August 19, 2016

---

# Developing Plugin: Call to undefined function add_menu_page()

 *  [dan.imbrogno](https://wordpress.org/support/users/danimbrogno/)
 * (@danimbrogno)
 * [18 years, 3 months ago](https://wordpress.org/support/topic/developing-plugin-call-to-undefined-function-add_menu_page/)
 *     ```
       <?php
   
       	//Set Up Class
       	if (!class_exists("B2BannerRotator")) {		
   
           	class B2BannerRotator {
   
               	function B2BannerRotator() { //constructor
       				}
   
       			//Admin Views
   
       		function Main() {
       				return 0;
       			}
   
              	}
          }
   
       	//Create new instance of class
          if (class_exists("B2BannerRotator")) {
                 $b2_banner_rotator = new B2BannerRotator();
          }
   
       	//Actions and Filters
       	if(isset($b2_banner_rotator)){
   
       		// Administration Actions
       		add_submenu_page(__FILE__, "Banner Rotator", "Banner Rotator", 6, __FILE__, array($b2_banner_rotator, "Main"));
       	}
   
       ?>
       ```
   

Viewing 1 replies (of 1 total)

 *  Thread Starter [dan.imbrogno](https://wordpress.org/support/users/danimbrogno/)
 * (@danimbrogno)
 * [18 years, 3 months ago](https://wordpress.org/support/topic/developing-plugin-call-to-undefined-function-add_menu_page/#post-703782)
 * Go figure, I try for 4 hours, then solve the problem 5 minutes after I post on
   the forum.
 * The issue seems to be that you cannot call add_menu_page or any of those functions
   from outside the class. You need to call add_action(‘admin_menu’,array(class,
   function_to_setup_menu));
 * Then in function_to_setup_menu, use add_menu_page().
    Here is a code sample:
 *     ```
       <?php
   
       	//Set Up Class
       	if (!class_exists("B2BannerRotator")) {		
   
           	class B2BannerRotator {
   
               	function B2BannerRotator() { //constructor
   
       				}
   
       		function Main() {
       				return 0;
       			}
   
       		function ConfigureMenu() {
       			add_menu_page("Test", "tesT", 6, 'b2_bannerrotator', array('B2BannerRotator','Main'));
       		}
   
              	}
          }
   
       	//Create new instance of class
          if (class_exists("B2BannerRotator")) {
                 $b2_banner_rotator = new B2BannerRotator();
          }
   
       	//Actions and Filters
       	if(isset($b2_banner_rotator)){
   
       		// Administration Actions
       		add_action('admin_menu', array($b2_banner_rotator,'ConfigureMenu'));
       	}
   
       ?>
       ```
   

Viewing 1 replies (of 1 total)

The topic ‘Developing Plugin: Call to undefined function add_menu_page()’ is closed
to new replies.

## Tags

 * [add_menu_page](https://wordpress.org/support/topic-tag/add_menu_page/)
 * [development](https://wordpress.org/support/topic-tag/development/)
 * [function](https://wordpress.org/support/topic-tag/function/)
 * [undefined](https://wordpress.org/support/topic-tag/undefined/)

 * 1 reply
 * 1 participant
 * Last reply from: [dan.imbrogno](https://wordpress.org/support/users/danimbrogno/)
 * Last activity: [18 years, 3 months ago](https://wordpress.org/support/topic/developing-plugin-call-to-undefined-function-add_menu_page/#post-703782)
 * Status: not resolved

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