I am not able to get my email input even after defining my sessions, please look below:
I have two scripts: The first is is to show the declaration of the session, while the second is to display the session's value:
First Script:sessionTest1.php

<?php
session_start();
?>
<html>
<head><title>Testing Sessions page 1</title></head>
<body>
<?php
$_SESSION['session_var'] = "testing";
@$_SESSION['session_var2'] = $_POST['email'];
echo "This is a test of the sessions feature.
<form action='sessionTest2.php' method='POST'>
<input type='hidden' name='form_var'
value='testing'>
<input type='text' name='email'>
<input type='submit' value='go to next page'>
</form>";
?>
</body></html>

Second Script:sessionTest2.php

<?php
session_start();
?>
<html>
<head><title>Testing Sessions page 2</title></head>
<body>
<?php
echo "session_var = {$_SESSION['session_var']}<br>\n";
echo "session_var2 = {$_SESSION['session_var2']}<br>\n";
echo "form_var = {$_POST['form_var']}<br>\n";
?>
</body></html>

Please what could be possibly wrong? or what should i do to obtain the entered value for the email and then be able to pass it along to as many pages as possible?

What is the ouput of these lines?

echo "session_var = {$_SESSION['session_var']}<br>\n";
echo "session_var2 = {$_SESSION['session_var2']}<br>\n";

It's better practice to have the variables outside the quotes like this (although this shouldn't affect the output):

echo "session_var = {".$_SESSION['session_var']."}<br>\n";
echo "session_var2 = {".$_SESSION['session_var2']."}<br>\n";

although this shouldn't affect the output

But in this case it would, using echo "Hi {$name}"; is okay, but array variables like $variable['XYZ'] it could well cause problems.

I'm sure the output will tell us where this problem lies.

I solved the problem by adjusting my first script to be like this:

<?php
session_start();
?>
<html>
<head><title>Testing Sessions page 1</title></head>
<body>
<?php
$_SESSION['session_var'] = "testing";
echo "This is a test of the sessions feature.
<form action='sessionTest2.php' method='POST'>
<input type='hidden' name='form_var'
value='testing'>
<input type='text' name='email'>
<input type='submit' value='go to next page'>
</form>";
?>
</body></html>

And my second script to become something like this:

<?php
session_start();
$_SESSION['session_var2'] = $_POST['email']; // This line is needed here, but unneeded in sessionTest1.php
?>
<html>
<head><title>Testing Sessions page 2</title></head>
<body>
<?php
echo "session_var = {$_SESSION['session_var']}<br>\n";
echo "session_var2 = {$_SESSION['session_var2']}<br>\n";
echo "form_var = {$_POST['form_var']}<br>\n";
?>
</body></html>

With the afore mentioned adjustments I was able to get my script to hold the submitted email as one move to other pages till the session is destroyed.