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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 | 
|---|---|
| 333 |      public function wp_loaded() { | 
| 334 |  | 
| 335 |           /** | 
| 336 |            * Fires once WordPress has loaded, allowing scripts and styles to be initialized. | 
| 337 |            * | 
| 338 |            * @since 3.4.0 | 
| 339 |            * | 
| 340 |            * @param WP_Customize_Manager $this WP_Customize_Manager instance. | 
| 341 |            */ | 
| 342 |           do_action( 'customize_register', $this ); | 
| 343 |  | 
| 344 |           if ( $this->is_preview() && ! is_admin() ) | 
| 345 |                $this->customize_preview_init(); | 
| 346 |      } | 
| 347 |  | 
| 348 |      /** | 
| 349 |       * Prevents AJAX requests from following redirects when previewing a theme | 
| 350 |       * by issuing a 200 response instead of a 30x. | 
| 351 |       * |