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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 |
|---|---|
| 414 | |
| 415 | /** |
| 416 | * Filters the site query results. |
| 417 | * |
| 418 | * @since 4.6.0 |
| 419 | * |
| 420 | * @param WP_Site[] $_sites An array of WP_Site objects. |
| 421 | * @param WP_Site_Query $query Current instance of WP_Site_Query (passed by reference). |
| 422 | */ |
| 423 | $_sites = apply_filters_ref_array( 'the_sites', array( $_sites, &$this ) ); |
| 424 | |
| 425 | // Convert to WP_Site instances. |
| 426 | $this->sites = array_map( 'get_site', $_sites ); |
| 427 | |
| 428 | return $this->sites; |
| 429 | } |
| 430 | |
| 431 | /** |
| 432 | * Used internally to get a list of site IDs matching the query vars. |