Determine whether a clause is first-order.
A "first-order" clause is one that contains any of the first-order clause keys (‘terms’, ‘taxonomy’, ‘include_children’, ‘field’, ‘operator’). An empty clause also counts as a first-order clause, for backward compatibility. Any clause that doesn’t meet this is determined, by process of elimination, to be a higher-order query.
(array) (Required) Tax query arguments.
(bool) Whether the query clause is a first-order clause.
File: wp-includes/class-wp-tax-query.php
protected static function is_first_order_clause( $query ) {
return is_array( $query ) && ( empty( $query ) || array_key_exists( 'terms', $query ) || array_key_exists( 'taxonomy', $query ) || array_key_exists( 'include_children', $query ) || array_key_exists( 'field', $query ) || array_key_exists( 'operator', $query ) );
} | Version | Description |
|---|---|
| 4.1.0 | Introduced. |
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https://developer.wordpress.org/reference/classes/wp_tax_query/is_first_order_clause