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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 | 
|---|---|
| 1412 |                 * | 
| 1413 |                 * The dynamic portion of the hook name, `$permastructname`, refers | 
| 1414 |                 * to the name of the registered permastruct, e.g. 'post_tag' (tags), | 
| 1415 |                 * 'category' (categories), etc. | 
| 1416 |                 * | 
| 1417 |                 * @since 3.1.0 | 
| 1418 |                 * | 
| 1419 |                 * @param string[] $rules Array of rewrite rules generated for the current permastruct, keyed by their regex pattern. | 
| 1420 |                 */ | 
| 1421 |                $rules = apply_filters( "{$permastructname}_rewrite_rules", $rules ); | 
| 1422 |  | 
| 1423 |                if ( 'post_tag' === $permastructname ) { | 
| 1424 |  | 
| 1425 |                     /** | 
| 1426 |                      * Filters rewrite rules used specifically for Tags. | 
| 1427 |                      * | 
| 1428 |                      * @since 2.3.0 | 
| 1429 |                      * @deprecated 3.1.0 Use {@see 'post_tag_rewrite_rules'} instead. | 
| 1430 |                      * |