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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 |
|---|---|
| 262 | * Fires before the WP_User_Query has been parsed. |
| 263 | * |
| 264 | * The passed WP_User_Query object contains the query variables, |
| 265 | * not yet passed into SQL. |
| 266 | * |
| 267 | * @since 4.0.0 |
| 268 | * |
| 269 | * @param WP_User_Query $query Current instance of WP_User_Query (passed by reference). |
| 270 | */ |
| 271 | do_action_ref_array( 'pre_get_users', array( &$this ) ); |
| 272 | |
| 273 | // Ensure that query vars are filled after 'pre_get_users'. |
| 274 | $qv =& $this->query_vars; |
| 275 | $qv = $this->fill_query_vars( $qv ); |
| 276 | |
| 277 | if ( is_array( $qv['fields'] ) ) { |
| 278 | $qv['fields'] = array_unique( $qv['fields'] ); |
| 279 | |
| 280 | $this->query_fields = array(); |