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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 |
---|---|
569 | * |
570 | * The passed WP_User_Query object contains the query variables, not |
571 | * yet passed into SQL. |
572 | * |
573 | * @since 4.0.0 |
574 | * |
575 | * @param WP_User_Query $this The current WP_User_Query instance, |
576 | * passed by reference. |
577 | */ |
578 | do_action( 'pre_get_users', $this ); |
579 |
|
580 | $qv =& $this->query_vars; |
581 |
|
582 | if ( is_array( $qv['fields'] ) ) { |
583 | $qv['fields'] = array_unique( $qv['fields'] ); |
584 |
|
585 | $this->query_fields = array(); |
586 | foreach ( $qv['fields'] as $field ) { |
587 | $field = 'ID' === $field ? 'ID' : sanitize_key( $field ); |