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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 973 |                          if ( is_null( $parent ) ) { | 
| 974 |                               break; | 
| 975 |                          } | 
| 976 |  | 
| 977 |                          $this->current_level++; | 
| 978 |                          $find_main_page = (int) $parent->post_parent; | 
| 979 |  | 
| 980 |                          if ( ! isset( $parent_name ) ) { | 
| 981 |                               /** This filter is documented in wp-includes/post-template.php */ | 
| 982 |                               $parent_name = apply_filters( 'the_title', $parent->post_title, $parent->ID ); | 
| 983 |                          } | 
| 984 |                     } | 
| 985 |                } | 
| 986 |           } | 
| 987 |  | 
| 988 |           $can_edit_post = current_user_can( 'edit_post', $post->ID ); | 
| 989 |  | 
| 990 |           if ( $can_edit_post && $post->post_status != 'trash' ) { | 
| 991 |                $lock_holder = wp_check_post_lock( $post->ID ); |