hvad mangler der i disse linier

er ved at gå ud af mit gode skind over dette

foreach( $db->mostRecentSearches() as $recentSearches )

foreach( $db->mostPopularSearches( 10, 7 ) as $recentSearches )

foreach( $db->mostPopularSearches( 10, FALSE, 1 ) as $recentSearches )

foreach( $db->mostPopularSearches( 10, FALSE, FALSE ) as $recentSearches )

får denne besked:
Invalid argument supplied for foreach()