WP_Tax_Query::sanitize_relation( string $relation ): string

Sanitizes a ‘relation’ operator.

Parameters

string Sanitized relation. Either 'AND' or 'OR'.

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

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

Version	Description
4.1.0	Introduced.

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