<?php
echo "<table><tr>"; 
$sorgu = mysql_query("select * from bla bla bla");
while($niphell = mysql_fetch_array($sorgu)) 
{ 
     $r++; 
echo "<td>".$niphell[tabloismi]."</td>";
     if ($r % 2 == 0 ) 
     { 
            echo "</tr><tr>"; 
            $r=0; 
     } 
} 
echo "</tr></table>"; 
?>