问如何从sql select查询结果中一次读取两条记录？

EN

while($row1 = mysql_fetch_array($result))
{
  $row2 = mysql_fetch_array($result);
  // Do something
}

$row1 = mysql_fetch_array($result);
while($row2 = mysql_fetch_array($result))
{
  // Do something
  $row1 = $row2
}

$row1 = mysql_fetch_array($result);
if($row1 != false){
  while($row2 = mysql_fetch_array($result);)
   {
     // do something

      $row1 = $row2 ;
  }


}