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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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220 | * Fires before the WP_User_Query has been parsed. |
221 | * |
222 | * The passed WP_User_Query object contains the query variables, |
223 | * not yet passed into SQL. |
224 | * |
225 | * @since 4.0.0 |
226 | * |
227 | * @param WP_User_Query $query Current instance of WP_User_Query (passed by reference). |
228 | */ |
229 | do_action_ref_array( 'pre_get_users', array( &$this ) ); |
230 |
|
231 | // Ensure that query vars are filled after 'pre_get_users'. |
232 | $qv =& $this->query_vars; |
233 | $qv = $this->fill_query_vars( $qv ); |
234 |
|
235 | if ( is_array( $qv['fields'] ) ) { |
236 | $qv['fields'] = array_unique( $qv['fields'] ); |
237 |
|
238 | $this->query_fields = array(); |