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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 |
|---|---|
| 201 | $this->parse_query(); |
| 202 | |
| 203 | /** |
| 204 | * Fires before networks are retrieved. |
| 205 | * |
| 206 | * @since 4.6.0 |
| 207 | * |
| 208 | * @param WP_Network_Query &$this Current instance of WP_Network_Query, passed by reference. |
| 209 | */ |
| 210 | do_action_ref_array( 'pre_get_networks', array( &$this ) ); |
| 211 | |
| 212 | // $args can include anything. Only use the args defined in the query_var_defaults to compute the key. |
| 213 | $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) ); |
| 214 | $last_changed = wp_cache_get( 'last_changed', 'networks' ); |
| 215 | if ( ! $last_changed ) { |
| 216 | $last_changed = microtime(); |
| 217 | wp_cache_set( 'last_changed', $last_changed, 'networks' ); |
| 218 | } |
| 219 | |