Title: Add WordPress Meta Boxes using PHP class
Last modified: November 22, 2019

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# Add WordPress Meta Boxes using PHP class

 *  [Chibueze Okechukwu](https://wordpress.org/support/users/sleekchib/)
 * (@sleekchib)
 * [6 years, 6 months ago](https://wordpress.org/support/topic/add-wordpress-meta-boxes-using-php-class/)
 * am working a WordPress plugin and I am trying to add meta boxes to WordPress 
   with PHP class, but it does not seem to be working. It spills an error that saying
   the add_meta_box function is undefined. Any ideas on how I can fix this. My code
   looks like below.
 *     ```
       <?php
       class seo_pyra_register_fields {
         public function __construct() {
           add_action( 'add_meta_boxes', 'seo_pyra_register_fields' );
         }
   
         public function seo_pyra_register_fields() {
   
           add_meta_box( 'seo_pyra-1', __( 'SEO Pyra', 'seo_pyra' ), 'seo_pyra_display_callback', 'post' );
   
           add_meta_box( 'seo_pyra-1', __( 'SEO Pyr', 'seo_pyra' ), 'seo_pyra_display_callback', 'page' );
   
         }
   
       }
   
       $enqueue_assets = new seo_pyra_register_fields();
       $enqueue_assets->seo_pyra_register_fields();
       ?>
       ```
   

Viewing 1 replies (of 1 total)

 *  Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * (@bcworkz)
 * [6 years, 6 months ago](https://wordpress.org/support/topic/add-wordpress-meta-boxes-using-php-class/#post-12166395)
 * Don’t call $enqueue_assets->seo_pyra_register_fields() directly (which in turn
   calls add_meta_box()) from plugin code. When plugins are loaded, WP is not yet
   stable. Calling it via “add_meta_boxes” action is the right way, but you’re adding
   your class method incorrectly.
 * add_action() calls are constructed differently when class methods are used for
   the callback. Do it like this:
    `add_action( 'add_meta_boxes', array( $this, '
   seo_pyra_register_fields'));`

Viewing 1 replies (of 1 total)

The topic ‘Add WordPress Meta Boxes using PHP class’ is closed to new replies.

## Tags

 * [meta_box](https://wordpress.org/support/topic-tag/meta_box/)

 * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/)
 * 1 reply
 * 2 participants
 * Last reply from: [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * Last activity: [6 years, 6 months ago](https://wordpress.org/support/topic/add-wordpress-meta-boxes-using-php-class/#post-12166395)
 * Status: not a support question

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