$key = wfMemcKey( 'MWSession', $id );
} while ( isset( $this->allSessionIds[$id] ) || is_array( $this->store->get( $key ) ) );
return $id;
$key = wfMemcKey( 'MWSession', $id );
} while ( isset( $this->allSessionIds[$id] ) || is_array( $this->store->get( $key ) ) );
return $id;