php - subtract value and update multiple rows -

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i have cart , want update database right stock values. ordered products inserted table, can't update stoc table right values.

foreach($_post['produsc'] $row=>$produsc) {      $produsc=mysqli_real_escape_string($link,$produsc);     $masurac=mysqli_real_escape_string($link,($_post['masurac'][$row]));     $codutc=mysqli_real_escape_string($link,($_post['codutc'][$row]));     $cantitatec=mysqli_real_escape_string($link,($_post['cantitatec'][$row]));     $pretc=mysqli_real_escape_string($link,($_post['pretc'][$row]));     $tokc=mysqli_real_escape_string($link,($_post['tokc'][$row]));     $row_data[] = "('$tokc' , '$codutc' , '$produsc' , '$masurac' , '$cantitatec' , '$pretc' , now())"; }  if (!empty($row_data)) { $sql = 'insert orders (order_id, idd, produs, masura, cantitate, pret, data) values '.implode  (',', $row_data); $result = mysqli_query($link, $sql); }  $up = "update stoc set                      stoc = stoc - ".$cantitatec."                 prodid = '".$_post['codutc'][$row]."' , masura = '".$_post['masurac'][$row]."'";                 mysqli_query($link, $up);

thx in advance


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