<?php
$name=$_POST['full_name'];
$email=$_POST['primary_email'];
$comments=$_POST['comments'];


$myFile="guestbook.txt";
$open = fopen($myFile, 'a') or die("Couldn't open file for writing!");
$entry = "$name|$email|$comments\n";
fwrite($open, $entry) or die("Couldn't write to file!");
fclose($open);

$all = file($myFile);
foreach($all as $element) {
    list($name,$email,$comments) = explode('|',$element,'3');
    echo "<table border="1"><tr><td>Name</td><td>$name</td></tr>";
    echo "<tr><td>Email</td><td>$email</td>/tr>";
    echo "<tr><td>Comments</td><td>$comments</td></tr>";
}