associative array that defines properties of the index to be created. Currently, only one property named FIELDS is supported. This property is also an associative with the names of the index fields as array indexes. Each entry of this array is set to another type of associative array that specifies properties of the index that are specific to each field. Currently, only the sorting property is supported. It should be used to define the sorting direction of the index. It may be set to either ascending or descending. Not all DBMS support index sorting direction configuration. The DBMS drivers of those that do not support it ignore this property. Use the function support() to determine whether the DBMS driver can manage indexes. Example array( 'fields' => array( 'user_name' => array( 'sorting' => 'ascending' ), 'last_login' => array() ) ) |