Update multiple MYSQL rows with PHP foreach loop (in array) only updating one row

I am trying to update multiple rows (MySQL) with data from an array (PHP), but only one row is being updated based on the first values in the array. I know I am just missing a loop somwhere. I am using a foreach loop already but that doesn't seem enough. I am close to getting it. How can I modify my existing code to make sure all rows update with the correct information?

To start, the $unit_details array contains this:

array(3) { 
  [0]=> array(4) { ["pid"]=> string(5) "29013" ["vid"]=> string(5) "29018" ["tax"]=> string(5) "10.74" ["upr"]=> string(5) "123.6" } 
  [1]=> array(4) { ["pid"]=> string(5) "29013" ["vid"]=> string(5) "29474" ["tax"]=> string(5) "13.81" ["upr"]=> string(5) "158.9" } 
  [2]=> array(4) { ["pid"]=> string(5) "29282" ["vid"]=> string(5) "29283" ["tax"]=> string(5) "34.76" ["upr"]=> string(3) "400" } 
}

    $updtunits = '';
    $order_id = '31989';
    $upar='';
    $uchid='';
    $utax='';
    $uamt='';

    foreach ($unit_details as $udt) {
        $upar .= $udt['pid'];
        $uchid .= $udt['vid'];
        $utax .= $udt['tax'];
        $uamt .= $udt['upr'];

        $updtunits =  $docdb->query(" UPDATE ords_meta
                                            SET net_rev='$uamt',
                                                tx_amount='$utax'
                                            WHERE order_id='$order_id'
                                            AND prod_id='$upar'
                                            AND var_id='$uchid'");
    }

Screenshot of database table ords_meta: Link to Database Screenshot Here

source https://stackoverflow.com/questions/68135876/update-multiple-mysql-rows-with-php-foreach-loop-in-array-only-updating-one-ro

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