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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 |
|---|---|
| 1397 | * |
| 1398 | * The dynamic portion of the hook name, `$permastructname`, refers |
| 1399 | * to the name of the registered permastruct, e.g. 'post_tag' (tags), |
| 1400 | * 'category' (categories), etc. |
| 1401 | * |
| 1402 | * @since 3.1.0 |
| 1403 | * |
| 1404 | * @param string[] $rules Array of rewrite rules generated for the current permastruct, keyed by their regex pattern. |
| 1405 | */ |
| 1406 | $rules = apply_filters( "{$permastructname}_rewrite_rules", $rules ); |
| 1407 | if ( 'post_tag' == $permastructname ) { |
| 1408 | |
| 1409 | /** |
| 1410 | * Filters rewrite rules used specifically for Tags. |
| 1411 | * |
| 1412 | * @since 2.3.0 |
| 1413 | * @deprecated 3.1.0 Use {@see 'post_tag_rewrite_rules'} instead. |
| 1414 | * |
| 1415 | * @param string[] $rules Array of rewrite rules generated for tags, keyed by their regex pattern. |