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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 |
|---|---|
| 305 | |
| 306 | /** |
| 307 | * Filters the site query results. |
| 308 | * |
| 309 | * @since 4.6.0 |
| 310 | * |
| 311 | * @param array $results An array of sites. |
| 312 | * @param WP_Site_Query &$this Current instance of WP_Site_Query, passed by reference. |
| 313 | */ |
| 314 | $_sites = apply_filters_ref_array( 'the_sites', array( $_sites, &$this ) ); |
| 315 | |
| 316 | // Convert to WP_Site instances. |
| 317 | $this->sites = array_map( 'get_site', $_sites ); |
| 318 | |
| 319 | return $this->sites; |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * Used internally to get a list of site IDs matching the query vars. |