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WP_Tax_Query::sanitize_relation( string $relation )

Sanitize a ‘relation’ operator.

(string) Sanitized relation ('AND' or 'OR').

public function sanitize_relation( $relation ) {
		if ( 'OR' === strtoupper( $relation ) ) {
			return 'OR';
		} else {
			return 'AND';
		}
	}

Used By	Description
wp-includes/class-wp-tax-query.php: WP_Tax_Query::sanitize_query()	Ensure the ‘tax_query’ argument passed to the class constructor is well-formed.
wp-includes/class-wp-tax-query.php: WP_Tax_Query::__construct()	Constructor.

Version	Description
4.1.0	Introduced.