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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 |
|---|---|
| 528 | * |
| 529 | * The passed WP_User_Query object contains the query variables, not |
| 530 | * yet passed into SQL. |
| 531 | * |
| 532 | * @since 4.0.0 |
| 533 | * |
| 534 | * @param WP_User_Query $this The current WP_User_Query instance, |
| 535 | * passed by reference. |
| 536 | */ |
| 537 | do_action( 'pre_get_users', $this ); |
| 538 | |
| 539 | $qv =& $this->query_vars; |
| 540 | |
| 541 | if ( is_array( $qv['fields'] ) ) { |
| 542 | $qv['fields'] = array_unique( $qv['fields'] ); |
| 543 | |
| 544 | $this->query_fields = array(); |
| 545 | foreach ( $qv['fields'] as $field ) { |
| 546 | $field = 'ID' === $field ? 'ID' : sanitize_key( $field ); |