where is the documentation for add_action() parameters?

2 comments

1. those parameters aren’t unique to the_posts, they’re parameters for the add_action() function

   add_action( $tag, $function_to_add, $priority, $accepted_args ); 
   

   the 10 is just the default priority and 1 is the default number of accepted arguments. since they’re both default, you don’t really need either.

   http://codex.wordpress.org/Function_Reference/add_action

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2. This is rather add_action() related.

   add_action( 
      'the_posts', //$tag
      array( &$this, 'have_gallery' ), //$function_to_add
      10, //$priority - run priority, when to execute given action 
      1 //$accepted_args - number of accepted arguments, one in this case
   );
   

   10 means default run priority and 1 stands for one argument that this function takes.

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