here my code: i want to update the field by array. i just fetch the data's from table then i want to update the the field for same table

// select query to get the value
    for($j=0;$j<count($capacity);$j++)
   {  
     $capaci=$capacity[$j];
    // select query to get the value
     $sql2=mysql_query("SELECT recieved-allocate*plate_quantity as ans from total_values where capacity='$capaci'"); 
     while($fetch=mysql_fetch_array($sql2)) 
     {
      $recieves=$fetch['ans'];
      $sql3="update total_values set recieved='$recieves' where capacity='$capaci' and month='$mon'";
      mysql_query($sql3);
     }
    }