WordPress Plugin Development Cookbook - Second Edition

How to do it...

1. Navigate to the ch4-book-reviews folder of the WordPress plugin directory of your development installation.
2. Open the ch4-book-reviews.php file in a code editor.
3. Add the following line of code after the existing functions to register a function to be called when the Book Reviews listings page is being prepared:

add_filter( 'manage_edit-book_reviews_columns',            'ch4_br_add_columns' ); 

4. Add the following code section to provide an implementation for the ch4_br_add_columns function:

function ch4_br_add_columns( $columns ) {     $columns['book_reviews_author'] = 'Author';     $columns['book_reviews_rating'] = 'Rating';     $columns['book_reviews_type'] = 'Type';      unset( $columns['comments'] );      return $columns; } 

5. Add the following ...