php get the max(accNumber) and then increment by 1 -

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i'm trying highest number , increment 1. blank page, here code 

   $query = $pdo->prepare("select max(accnum) accounts");         $query->execute();         while($num = $query->fetchall()){          if($num[1] == null){          $accnumber = "100001";          }else{          $accnumber = $num[1]++;      }         echo $accnumber;     }

what doing wrong here. thanks

  $query = $pdo->prepare("select max(accnum) accounts");         $query->execute();         while($num = $query->fetchall()){          if($num[0] == null){          $accnumber = "100001";          }else{          $accnumber = $num[0]++;      }         echo $accnumber;     }

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