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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 |
|---|---|
| 588 | * |
| 589 | * The passed WP_User_Query object contains the query variables, not |
| 590 | * yet passed into SQL. |
| 591 | * |
| 592 | * @since 4.0.0 |
| 593 | * |
| 594 | * @param WP_User_Query $this The current WP_User_Query instance, |
| 595 | * passed by reference. |
| 596 | */ |
| 597 | do_action( 'pre_get_users', $this ); |
| 598 | |
| 599 | $qv =& $this->query_vars; |
| 600 | |
| 601 | if ( is_array( $qv['fields'] ) ) { |
| 602 | $qv['fields'] = array_unique( $qv['fields'] ); |
| 603 | |
| 604 | $this->query_fields = array(); |
| 605 | foreach ( $qv['fields'] as $field ) { |
| 606 | $field = 'ID' === $field ? 'ID' : sanitize_key( $field ); |