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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 | 
|---|---|
| 1437 |                $this->rules = array_merge($this->extra_rules_top, $robots_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite,  $author_rewrite, $date_rewrite, $post_rewrite, $page_rewrite, $this->extra_rules); | 
| 1438 |  | 
| 1439 |           /** | 
| 1440 |            * Fires after the rewrite rules are generated. | 
| 1441 |            * | 
| 1442 |            * @since 1.5.0 | 
| 1443 |            * | 
| 1444 |            * @param WP_Rewrite $this Current WP_Rewrite instance, passed by reference. | 
| 1445 |            */ | 
| 1446 |           do_action_ref_array( 'generate_rewrite_rules', array( &$this ) ); | 
| 1447 |  | 
| 1448 |           /** | 
| 1449 |            * Filters the full set of generated rewrite rules. | 
| 1450 |            * | 
| 1451 |            * @since 1.5.0 | 
| 1452 |            * | 
| 1453 |            * @param array $this->rules The compiled array of rewrite rules. | 
| 1454 |            */ | 
| 1455 |           $this->rules = apply_filters( 'rewrite_rules_array', $this->rules ); |