PHP - refreshing page and showing different rows in a table

Question 1

The following (tested) uses PHP sessions and JS setTimeout.
Interesting, but I wonder if I will ever use this effect. (I was unable to save the $handle as a session variable.)

<?php // z1.php is this file, z1.csv is the data file
session_start();
echo <<<EOD
<body onload="setTimeout('f1();',3000);">
<script type="text/javascript">
function f1() { window.location.replace("z1.php"); } 
</script>
EOD;

if (isset($_SESSION['sessrow1st'])) { $row1st = $_SESSION['sessrow1st']; }
else { $row1st = 1; }
$handle = fopen("z1.csv", "r");
if ($handle === false) { exit("open error"); };
echo "<table border='1'>\n";
$rownum = 0;
while (($data = fgetcsv($handle, 1000, ";")) !== FALSE) {
  $rownum += 1;
  if ($rownum < $row1st) continue;
  if ($rownum > $row1st+6) break; 
  $numcols = count($data);
  echo '<tr>';
  for ($c=0; $c < $numcols; $c++) {
    if(empty($data[$c])) { $value = "&nbsp;"; }
    else { $value = $data[$c]; }
    echo '<td>'.$value.'</td>'; }
  echo "</tr>\n"; }
echo '</table></body>';
if (feof($handle)) { $rownum = 1; }
fclose($handle);
$_SESSION['sessrow1st'] = $rownum;
?>

Question 2

You can use Javascript's setTimeout and a get variable to accomplish this.

//if pageNum isset figure out where to start(7 rows per page * page num +1
$pageNum = isset($_GET['pageNum']) ? (int)$_GET['pageNum'] : 0;
$startRow = $pageNum == 0 ? 0 : ($pageNum * 7 + 1);
$endRow = $startRow + 7;
$count = 0;
while (($data = fgetcsv($handle, 1000, ";")) !== FALSE) {
    if($count >= $startRow)
    {
        $num = count($data);
        if ($row == 1) {
            echo '<tr>';
        }else{
            echo '<tr>';
        }

        for ($c=0; $c < $num; $c++) {
            //echo $data[$c] . "<br />\n";
            if(empty($data[$c])) {
               $value = "&nbsp;";
            }else{
               $value = $data[$c];
            }
            if ($row == 1) {
                echo '<th>'.$value.'</th>';
            }else{
                echo '<td>'.$value.'</td>';
            }
        }

        if ($row == 1) {
            echo '</tr></thead><tbody>';
        }else{
            echo '</tr>';
        }
        $row++;
    }
    if($count == $endRow)
    {
        //make it dynamic...
        $theUrl = $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']."?pageNum=".($pageNum+1);
        //wait 3 seconds then use javascript to redirect.
        echo '<script>setTimeout(function(){
                 window.location.href="'.$theUrl.'"}, 3000)
              </script>';
    }
    ++$count;

}

First step is figure out which page you're on, then display what you want, then use javascript redirect, as php redirect will fail after headers are sent. Also the setTimeout function is what controls the wait