WordPress – Adding custom field to the post screen

1 comment

1. You can use the add_meta_box function. You also need a callback function that outputs the form html on the post screen and a save function.

   Here is a basic example that adds a URL meta box to lower right hand side of the post screen.

   add_action( 'add_meta_boxes', 'c3m_sponsor_meta' );
           function c3m_sponsor_meta() {
                   add_meta_box( 'c3m_meta', 'Sponsor URL Metabox', 'c3m_sponsor_url_meta', 'post', 'side', 'high' );
                   }
   
               function c3m_sponsor_url_meta( $post ) {
                   $c3m_sponsor_url = get_post_meta( $post->ID, '_c3m_sponsor_url', true);
                   echo 'Please enter the sponsors website link below';
                   ?>
                   <input type="text" name="c3m_sponsor_url" value="<?php echo esc_attr( $c3m_sponsor_url ); ?>" />
                   <?php
           }
   
   add_action( 'save_post', 'c3m_save_project_meta' );
           function c3m_save_project_meta( $post_ID ) {
               global $post;
               if( $post->post_type == "post" ) {
               if (isset( $_POST ) ) {
                   update_post_meta( $post_ID, '_c3m_sponsor_url', strip_tags( $_POST['c3m_sponsor_url'] ) );
               }
           }
           }
   

   Edit: Corrected namespace error in code above.

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