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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 | $network_data = null; |
| 201 | |
| 202 | /** |
| 203 | * Filter the network data before the query takes place. |
| 204 | * |
| 205 | * Return a non-null value to bypass WordPress's default network queries. |
| 206 | * |
| 207 | * The expected return type from this filter depends on the value passed in the request query_vars. |