ah, yes, you have an array by row, with an array with row cells (do a var_dump to see).
$F=$objPHPExcel->getActiveSheet();
//values for test
$F ->setCellValue('C2', 10)
->setCellValue('D2', 20)
->setCellValue('E2', 30);
//extract values
$arrayValues=$F->rangeToArray('C2:E2');
if(is_array($arrayValues) && array_key_exists(0, $arrayValues) && is_array($arrayValues[0])){
foreach($arrayValues[0] as $aValue){
echo $aValue;
}
}else{
echo 'something wrong...';
}