traversing multi-dimensional arrays

Hello all, What is the best way to do this? I have two arrays: $cars=array("ford","chevy"); $models=array("ford"=>array("ranger","escape"),"chevy"=>array("malibu","tahoe")); then I need to traverse both arrays: foreach ($cars as $car){ //now I need to get into the models array and echo out all of the models that //coincide with the specific car so it should print out ford-ranger //I basically want to do this but can't //how can I get into this second array without looping through the whole thing each time? foreach($cars[$car] as $model){ } } Thanks!