passing variables through session - php - php

Question

I'm new to php and I'm trying to pass a the value of a submit button through a session.
my code so far looks like this:
main_page.php
session_start();
echo '<form method="post" action="details_page.php">';
echo '<li><a href="ifconfig.php> <input type="submit" name=submit value='."$ip_address".' /></a></li>';
echo '</form>';
$value_to_pass = $_POST[submit];
echo $value_to_pass;
$_SESSION['value'] = $value_to_pass;
}
details_page.php
session_start();
echo $value_to_pass = $_SESSION['value'];
echo $value_to_pass;
I need it to print $value_to_pass in the details_page.php

Answer 1

This is highly confusing
session_start();
echo '<form method="post" action="details_page.php">';
echo '<li><a href="ifconfig.php> <input type="submit" name=submit value='."$ip_address".' /></a></li>';
echo '</form>';
$value_to_pass = $_POST[submit];
echo $value_to_pass;
$_SESSION['value'] = $value_to_pass;
Consider changing it to this so that your POST code only gets executed when the form is actually submitted. Without this check your SESSION will be assigned a blank value when the form is not submitted which may be giving you odd results.
session_start();
echo '<form method="post" action="details_page.php">';
echo '<li><a href="ifconfig.php> <input type="submit" name=submit value='."$ip_address".' /></a></li>';
echo '</form>';
// Note also you need single quotes in the $_POST array around 'submit'
if(isset($_POST['submit']))
{
$value_to_pass = $_POST[submit];
echo $value_to_pass;
$_SESSION['value'] = $value_to_pass;
}
And change details_page.php to
session_start();
// Do not echo this line, as you are echoing the assignment operation.
$value_to_pass = $_SESSION['value'];
var_dump($value_to_pass);

Answer 2

first You change your below code
echo '<form method="post" action="details_page.php">';
echo '<li><a href="ifconfig.php> <input type="submit" name=submit value='."$ip_address".' /></a></li>';
echo '</form>';
with the below
echo '<form method="post" action="details_page.php">';
echo '<input type="hidden" name="ip_address" id="ip_address" value="'.$ip_address.'">';
echo '<li><a href="ifconfig.php> <input type="submit" name=submit /></a></li>';
echo '</form>';
this is the best practice actually. I also followed this. So try to avoid passing values in "submit" button. pass it to "hidden" field.
and then get the value like below:-
$value_to_pass = $_POST["ip_address"];
I think it will help You. Thanks.