You won't be using tables with flat files; tables are a database thing

.
Basically, create a text file that looks like this (except use actual values):
username|password|email|age|otherinformation
Then, in PHP, you can use this code to read out this information:
<?php
$fp = fopen('ile.txt','r');
if (!$fp) {
echo 'ERROR: Unable to open file.</table></body></html>';
exit;
}
while (!feof($fp)) {
$line = fgets($fp, 1024);
list($field1, $field2, $field3, $field4, $field5) = split('\|', $line);
echo '
<tr>
<td>'.$field1.'</td>
<td>'.$field2.'</td>
<td>'.$field3.'</td>
<td>'.$field4.'</td>
<td>'.$field5.'</td>
<td>'.$field6.'</td>
</tr>';
$fp++;
}
fclose($fp);
?>
If you need more information, check out
this site. It's got a great tutorial about flat files!