Add for loop based on conditional

I have a function which return two kind of array as below

// first array

 $arr = array('P'=>array('val1'=>1,'val2'=>12),'T'=>array('val1'=>4,'val2'=>5));

//second array

$arr=array('South'=>array('P'=>array('val1'=>1,'val2'=>12),'T'=>array('va11'=>14,'val2'=>15),
'North'=>array('P'=>array('val1'=>6,'val2'=>9),'T'=>array('va11'=>23,'val2'=>22));

The second arr has a index more than the first array, which i want to loop and display

// my code

 $arrStr = 'first';
 if($flag ==1 )
 $arrStr = 'second';
  if($flag ==1)
      for($retarr =>$directionIndex => $retArr) {
          for(${$arrStr} as $ky=>$valArr) {
          // so i have to close the for loop also based on condition , which does not work , 


           } // end of first for 
             if($flag ==1)
           }  // end of second for

Is there a better way to loop on condition , or should i correct the function and split the whole display thing duplicated twice based on flag