There is a problem with the two settings.

Two sets of paging problems, think of it... & lt ;? Php $ offset & nbsp; isset ($ _ GET [pid])? Intval ($ _ GET [pid]): 1; if (! $ Offset) & nbsp; $ offset & nbsp; 1; $ perpage & nbsp; 50; $ db & nbsp; NEW & nbsp; two sets of paging problems, think of it...

 $offset = isset($_GET['pid'])?intval($_GET['pid']):1;
if(!$offset) $offset = 1;
$perpage = 50;


$db = NEW PDO("mysql:host=localhost; port = 3306; dbname =library", 'root', 'cai123');
$total = $db->query('SELECT COUNT(*) FROM library.messages')->fetchColumn(0);

$sql = 'SELECT * FROM library.messages'." LIMIT $perpage OFFSET ".($offset-1);
$result = $db->query($sql);
if ($result)
{
foreach ($result->fetchAll() as $row)
{
echo "subject:    ".$row[5]."
";
}
}
else
{
$error = $db->errorInfo();
echo "error happened..".$error[2];
exit();
}

buildIndex($perpage, $total);//1,50,3500

/////////////////////////////////////////////////////////////////
function buildLink($index, $offset)
{
echo "$index";
}


function buildIndex($perpage, $total)
{
$separator = '|';
//buildLink($offset==1, '<
 
for ($start = 1, $end = $perpage; $end < $total; $start += $perpage, $end += $perpage)
{
echo $separator;
buildLink("$start-$end", $start);
}

$end = ($total > $start) ? "$total":"";
echo $separator;
buildLink("$start-$end", $start);
}




?>

Another idea .....

 $offset = isset($_GET['pid'])?intval($_GET['pid']):1;
if(!$offset) $offset = 1;
$perpage = 50;


$db = NEW PDO("mysql:host=localhost; port = 3306; dbname =library", 'root', 'cai123');
$total = $db->query('SELECT COUNT(*) FROM library.messages')->fetchColumn(0);

$sql = 'SELECT * FROM library.messages LIMIT '. ($offset -1)*$perpage.", $perpage ";
$result = $db->query($sql);
if ($result)
{
foreach ($result->fetchAll() as $row)
{
echo "subject:    ".$row[5]."
";
}
}
else
{
$error = $db->errorInfo();
echo "error happened..".$error[2];
exit();
}

$numpage = $total%$perpage;
if($total%$perpage) $numpage++;
$cur = $offset;
if ($cur < $numpage)
{
echo " Next Page
";
}
if($cur > 0)
{
echo " Prev Page
";

}


?>

The problem is as follows: each time you click the next page or the previous page, the same content is displayed, that is, the homepage content. When there are 3000 rows in the data table, why?
------ Solution --------------------
42 rows have... setPage02.php? Offset = $ I '> $ I ....
And the 2nd rows are $ offset = isset ($ _ GET ['ofset'])? Intval ($ _ GET ['offset']): 1;

Do you know where the problem is?