$base = Array(
    Array
        (
            "month" => '2010-01',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),

    Array
        (
            "month" => '2010-02',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),

    Array
        (
            "month" => '2010-03',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),

    Array
        (
            "month" => '2010-04',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),

    Array
        (
            "month" => '2010-05',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),

    Array
        (
            "month" => '2010-06',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),

    Array
        (
            "month" => '2010-07',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),


    Array
        (
            "month" => '2010-08',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),

    Array
        (
            "month" => '2010-09',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),


    Array
        (
            "month" => '2010-10',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),

    Array
        (
            "month" => '2010-11',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
        ),

    Array
        (
            "month" => '2010-12',
            "KFC" => '0',
            "PZH" => '0',
            "SUB" => '0'
         )
    );

$result = mysqli_query($con, "SELECT brand,
DATE_FORMAT( date_time, '%Y' ) AS 'year',
DATE_FORMAT( date_time, '%m' ) AS 'month',
SUM(brand='PZH') AS PZH,
SUM(brand='KFC') AS KFC,
SUM(brand='SUB') AS SUB
FROM scan_report WHERE DATE_FORMAT( date_time, '%Y' ) =2010 AND id = ".$_SESSION['userinfo']['id']."
GROUP BY DATE_FORMAT( date_time, '%Y%m' )") or die(mysqli_error($con));
$num_rows = 1;

while ($row = mysqli_fetch_array($result)) {
foreach($base as &$value) {

    echo $num_rows;
    if ($value['month'] == $row['year'].'-'.$row['month']){
        $value['KFC'] = $row['KFC'];
        $value['PZH'] = $row['PZH'];
        $value['SUB'] = $row['SUB'];

     }

}
$num_rows++;
}