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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 |
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199 | $this->parse_query(); |
200 |
|
201 | /** |
202 | * Fires before networks are retrieved. |
203 | * |
204 | * @since 4.6.0 |
205 | * |
206 | * @param WP_Network_Query &$this Current instance of WP_Network_Query, passed by reference. |
207 | */ |
208 | do_action_ref_array( 'pre_get_networks', array( &$this ) ); |
209 |
|
210 | // $args can include anything. Only use the args defined in the query_var_defaults to compute the key. |
211 | $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) ); |
212 | $last_changed = wp_cache_get_last_changed( 'networks' ); |
213 |
|
214 | $cache_key = "get_network_ids:$key:$last_changed"; |
215 | $cache_value = wp_cache_get( $cache_key, 'networks' ); |
216 |
|
217 | if ( false === $cache_value ) { |