colspan css

after i put conspan   i want to put the text but i still want the border of table how can i fix this problem

 <td colspan=7 height=18 class=xl8921921 style='height:13.5pt'><?php

  for ($i=0; $i<count($allrowshead); $i++)
{
     $textg = $allrowshead[$i]["grandtotal"];
            $cheque_amt = "$textg";

$split = explode(".",$cheque_amt);
    $output = convert_number($split[0])." baht and ";
    if (isset($split[1])){
        $output .= convert_number($split[1])." satang";  
    }

echo $output;
       
}
 

 
 
 
 
  ?></td>
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