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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 |
|---|---|
| 205 | * Return a non-null value to bypass WordPress's default site queries. |
| 206 | * |
| 207 | * |
| 208 | * @since 5.2.0 |
| 209 | * |
| 210 | * @param array|null $site_ids Return an array of site data to short-circuit WP's site query, |
| 211 | * or null to allow WP to run its normal queries. |
| 212 | * @param WP_Network_Query $this The WP_Network_Query instance, passed by reference. |
| 213 | */ |
| 214 | $network_ids = apply_filters_ref_array( 'networks_pre_query', array( $network_ids, &$this ) ); |
| 215 | |
| 216 | if ( null === $network_ids ) { |
| 217 | |
| 218 | // $args can include anything. Only use the args defined in the query_var_defaults to compute the key. |
| 219 | $_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ); |
| 220 | |
| 221 | // Ignore the $fields argument as the queried result will be the same regardless. |
| 222 | unset( $_args['fields'] ); |
| 223 | |