Ben aşağıdaki hataları alıyorum

Notice: Undefined variable: header in C:\wamp\www\test\test1.php on line 27
Notice: Undefined variable: row in C:\wamp\www\test\test1.php on line 41
Deprecated: Function split() is deprecated in C:\wamp\www\test\test1.php on line 42
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 43
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 44
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 45
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 46
Notice: Undefined variable: sortkey in C:\wamp\www\test\test1.php on line 47
Deprecated: Function split() is deprecated in C:\wamp\www\test\test1.php on line 42
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 43
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 44
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 45
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 46
Notice: Undefined variable: sortkey in C:\wamp\www\test\test1.php on line 47
Deprecated: Function split() is deprecated in C:\wamp\www\test\test1.php on line 42
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 43
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 44
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 45
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 46
Notice: Undefined variable: sortkey in C:\wamp\www\test\test1.php on line 47
Deprecated: Function split() is deprecated in C:\wamp\www\test\test1.php on line 42
Notice: Undefined offset: 3 in C:\wamp\www\test\test1.php on line 42
Notice: Undefined offset: 2 in C:\wamp\www\test\test1.php on line 42
Notice: Undefined offset: 1 in C:\wamp\www\test\test1.php on line 42
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 43
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 44
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 45
Notice: Undefined variable: sortby in C:\wamp\www\test\test1.php on line 46
Notice: Undefined variable: sortkey in C:\wamp\www\test\test1.php on line 47

Aşağıdaki kod ile

 <span class="style2">
<style type="text/css">
<!--
body, th, td, p, small {
    font-family:'Times New Roman',Times,serif;
    font-size:100%;
    color:#757675;
}
small {font-size:90%;}

td, th {
    background-color:#FFFFFF;
    border:1px solid #CCCCCC;
    padding:7px 20px 7px 20px;
}
th {background-color:#a5a5a5; color:#FFFFFF;}

h1 {font-size:120%; color:#558;}
h1 .sortby {color:#855;}
-->
</style>
</span>

<?php
echo '<h1><span class="sortby">'.$header.'</span></h1>
<table cellspacing="5" summary="List of demo fields">
<tr>
<th>Date & Time Added</th>
<th>Products</th>
<th>Keys</th>
<th>Computer</th>
</tr>';

$fp = fopen('key.txt','r');
if (!$fp) {echo 'ERROR: Unable to open file.</table></body></html>'; exit;}

while (!feof($fp)) {
    $line = fgets($fp,1024); //use 2048 if very long lines
    $row++;
    list ($date, $products, $keys, $computer) = split ('\|', $line);
    if ($sortby == 'Date Added') $sortkey = strtolower($date);
    if ($sortby == 'Products') $sortkey = strtolower($products);
    if ($sortby == 'Keys') $sortkey = strtolower($keys);
    if ($sortby == 'Computer') $sortkey = strtolower($computer);
    $col[$row] = array($sortkey, $date, $products, $keys, $computer);
}

fclose($fp);

$arrays = count($col) - 1;

$loop = 0;
while ($loop < $arrays) {
    $loop++;
    echo '
<tr>
<td>'.$col[$loop][1].'</td>
<td>'.$col[$loop][2].'</td>
<td>'.$col[$loop][3].'</td>
<td>'.$col[$loop][4].'</td>
</tr>';
}

echo '
</table>
 '
?>

AMA benim tablo ben bunu yapmak istiyorum ne doğru gösteren ve yapıyor ben neden iam alıyorum bu hataları bilmiyorum.