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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 |
|---|---|
| 301 | * Otherwise the filter should return an array of WP_Site objects. |
| 302 | * |
| 303 | * @since 5.2.0 |
| 304 | * |
| 305 | * @param array|int|null $site_data Return an array of site data to short-circuit WP's site query, |
| 306 | * the site count as an integer if `$this->query_vars['count']` is set, |
| 307 | * or null to run the normal queries. |
| 308 | * @param WP_Site_Query $this The WP_Site_Query instance, passed by reference. |
| 309 | */ |
| 310 | $site_data = apply_filters_ref_array( 'sites_pre_query', array( $site_data, &$this ) ); |
| 311 | |
| 312 | if ( null !== $site_data ) { |
| 313 | return $site_data; |
| 314 | } |
| 315 | |
| 316 | // $args can include anything. Only use the args defined in the query_var_defaults to compute the key. |
| 317 | $_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ); |
| 318 | |
| 319 | // Ignore the $fields argument as the queried result will be the same regardless. |