How to get the minimum value from array row

Question

I trying to get the minimum values from the any column contains \"xx\" in the column name.

Below is my code:

Answer 1

$array = array(
         array(
          'id' => 14,
          '10xx' => 14,
          '11xx' => 32,
          '12xx' => 4
         ),

          array(
           'id' => 2,
          '10xx' => 13,
          '11xx' => 36,
          '12xx' => 41
          )
        );

    $lowestKey = '';

    foreach($array as $arra){
        foreach ($arra as $key=>$value){
            if ($key == 'id'){
                if(($value < $lowestKey )||( $lowestKey== '')){
                $lowestKey = $value;
                }
            }


        }
    }
   echo $lowestKey;