How to filter posts, pages, archives and others page?

2 comments

1. You can check if a specific page is being displayer with these conditonals

   is_page()   //For pages
   is_single   //for posts
   is_singular //for posts AND pages
   is_category //for categories
   is_tag()    //for tags
   is_404()    //for 404 page
   

   Also, don’t use anonymous functions when you add filters. always use defined functions

   add_filter ('the_content','my_magic_function');
   

   For a more complete list of template tags check visit:
   http://codex.wordpress.org/Function_Reference/is_page

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2. We use Conditional Tags:

   add_filter( 'the_content', function( $content )
   {
       is( !is_single() )
           return $content;
   
       return '<p>This is a single post.</p>' . $content;
   });
   

   _{sample code requires PHP 5.3+}

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