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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 | 
|---|---|
| 5337 |  | 
| 5338 |      /** | 
| 5339 |       * Filters the URI for a page. | 
| 5340 |       * | 
| 5341 |       * @since 4.4.0 | 
| 5342 |       * | 
| 5343 |       * @param string  $uri  Page URI. | 
| 5344 |       * @param WP_Post $page Page object. | 
| 5345 |       */ | 
| 5346 |      return apply_filters( 'get_page_uri', $uri, $page ); | 
| 5347 | } | 
| 5348 |  | 
| 5349 | /** | 
| 5350 |  * Retrieve a list of pages (or hierarchical post type items). | 
| 5351 |  * | 
| 5352 |  * @global wpdb $wpdb WordPress database abstraction object. | 
| 5353 |  * | 
| 5354 |  * @since 1.5.0 | 
| 5355 |  * |