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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 |
|---|---|
| 292 | $this->meta_query->parse_query_vars( $this->query_vars ); |
| 293 | |
| 294 | /** |
| 295 | * Fires before sites are retrieved. |
| 296 | * |
| 297 | * @since 4.6.0 |
| 298 | * |
| 299 | * @param WP_Site_Query $query Current instance of WP_Site_Query (passed by reference). |
| 300 | */ |
| 301 | do_action_ref_array( 'pre_get_sites', array( &$this ) ); |
| 302 | |
| 303 | // Reparse query vars, in case they were modified in a 'pre_get_sites' callback. |
| 304 | $this->meta_query->parse_query_vars( $this->query_vars ); |
| 305 | if ( ! empty( $this->meta_query->queries ) ) { |
| 306 | $this->meta_query_clauses = $this->meta_query->get_sql( 'blog', $wpdb->blogs, 'blog_id', $this ); |
| 307 | } |
| 308 | |
| 309 | $site_data = null; |
| 310 | |