Taxonomy Custom Column - 'manage_{TAXONOMY}_custom_column' filter only passing 2 arguments

Question

I am trying to add a custom column to the tables shown on the Tags & Categories admin pages in Wordpress.

I have created a function, and added it as a filter using

add_filter( 'manage_post_tag_custom_column' , 'my_custom_column' , 10 , 2 );

My function is

my_custom_column( $out , $name , $term_id ){
  switch( $name ){
    case 'my_column_slug' :
      echo '<pre>';var_dump( func_get_args() );echo '</pre>';
      break;
  }
}

My column is shown in the table, with the <pre>...</pre> content, but it seems that no $term_id is being passed to my function.

array(2) {
  [0]=>
  string(0) ""
  [1]=>
  string(12) "my_column_slug"
}

I have referred to a number of resources to confirm that there should be three arguments passed to the function (including this StackExchange article). Am I missing something here?

Answer 1

You are using wrong number of arguments in add_filter, you specified to get 2 arguments and you are looking for third one:

Update your add_filter code to this:

add_filter( 'manage_post_tag_custom_column' , 'my_custom_column' , 10 , 3 );

The 3 in the end tells the filter to provide all the three arguments to your function.