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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 | * |