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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 |
|---|---|
| 609 | * |
| 610 | * The passed WP_User_Query object contains the query variables, not |
| 611 | * yet passed into SQL. |
| 612 | * |
| 613 | * @since 4.0.0 |
| 614 | * |
| 615 | * @param WP_User_Query $this The current WP_User_Query instance, |
| 616 | * passed by reference. |
| 617 | */ |
| 618 | do_action( 'pre_get_users', $this ); |
| 619 | |
| 620 | $qv =& $this->query_vars; |
| 621 | |
| 622 | if ( is_array( $qv['fields'] ) ) { |
| 623 | $qv['fields'] = array_unique( $qv['fields'] ); |
| 624 | |
| 625 | $this->query_fields = array(); |
| 626 | foreach ( $qv['fields'] as $field ) { |
| 627 | $field = 'ID' === $field ? 'ID' : sanitize_key( $field ); |