Sanitizes a ‘relation’ operator.

$relation string Required

Raw relation key from the query argument.

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

File: wp-includes/class-wp-tax-query.php. View all references

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