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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 |
|---|---|
| 189 | $this->parse_query(); |
| 190 | |
| 191 | /** |
| 192 | * Fires before networks are retrieved. |
| 193 | * |
| 194 | * @since 4.6.0 |
| 195 | * |
| 196 | * @param WP_Network_Query $this Current instance of WP_Network_Query (passed by reference). |
| 197 | */ |
| 198 | do_action_ref_array( 'pre_get_networks', array( &$this ) ); |
| 199 | |
| 200 | // $args can include anything. Only use the args defined in the query_var_defaults to compute the key. |
| 201 | $_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ); |
| 202 | |
| 203 | // Ignore the $fields argument as the queried result will be the same regardless. |
| 204 | unset( $_args['fields'] ); |
| 205 | |
| 206 | $key = md5( serialize( $_args ) ); |
| 207 | $last_changed = wp_cache_get_last_changed( 'networks' ); |