"Branch1": 663134.44

"Branch1": 492784.54

"Branch1": 757639.93

"Branch1": 569404.61

<?php
  $dbhost = 'localhost';
  $dbname = 'spmdb';
  $dbuser = 'root';
  $dbpass = '';


  try{

    $dbcon = new PDO("mysql:host={$dbhost};dbname={$dbname}",$dbuser,$dbpass);
    $dbcon->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

  }catch(PDOException $ex){

    die($ex->getMessage());
  }
$stmt = $dbcon->prepare("SELECT month.monthname,coll.branch,coll.cf FROM coll INNER JOIN month ON month.id = coll.`month` group by coll.month,coll.branch");
$stmt->execute();
$row1 = [];
while($row=$stmt->fetch(PDO::FETCH_ASSOC))
    {
        extract($row);
        $row1[]= ['month' => $monthname, $branch => $cf];

    }
    echo json_encode($row1,JSON_NUMERIC_CHECK);
?>

[{"month":"Jan","Branch4":40275}
,{"month":"Feb","Branch5":165173.91}
,{"month":"Feb","Branch1":93360.33}
,{"month":"Apr","Branch1":65415.75}]