How to display sessions information using php - php

Question

I am trying to display session information like username, as user login through login page, the session has to capture user entered username and should display in page. Below i have tried php script, but its not echoing the username, Kindly check in the script for errors, thanks in advance.
<?php
session_start();
$_SESSION['test']= $_POST['myusername'];
$name= $_SESSION['test'];
echo $name;
?>
<form action="login.php" method="post">
<p>Username</p>
<input name="myusername" type="text" id="myusername" required>
<p>Password</p>
<input name="mypassword" type="password" id="mypassword"required></br>
<button><img src="http://icons.iconarchive.com/icons/webiconset/application/32/Register-icon.png" /></button>
</form>
login.php
Output i am getting is , simply its going to next page without displaying user name.

Answer 1

You can't access session data until after you call session_start(). So your first if statement is unnecessary and problematic as you can't check if a session variable exists until after you start your session. Also, make sure session_start() is called at the top of every page you wish to use sessions.
<?php
session_start();
$_SESSION['test']= $_POST['myusername'];

Answer 2

You must varify first that is session started or not. you can check it by using this code for Version PHP >= 5.4.0:-
if (session_status() !== PHP_SESSION_ACTIVE) {session_start();}
or
if (session_status() == PHP_SESSION_NONE) {
session_start();
}
or by this code for Version PHP < 5.4.0:-
if (session_id() === "") { session_start(); }
Then you can see all session stored values just by printing them as array.
echo "<pre>";
print_r($_SESSION);
then you can assign to session your post varible value like this.
$_SESSION['test']= $_POST['myusername'];
echo $_SESSION['test'];

Answer 3

You are setting session before post. Please use below code.
login.php
<?php
if(isset($_POST['myusername']))
{
// your code
session_start();
$_SESSION['test']= $_POST['myusername'];
}
?>
<form action="login.php" method="post">
<p>Username</p>
<input name="myusername" type="text" id="myusername" required>
<p>Password</p>
<input name="mypassword" type="password" id="mypassword"required></br>
<button><img src="http://icons.iconarchive.com/icons/webiconset/application/32/Register-icon.png" /></button>
</form>
newpage.php
<?php
session_start();
echo $_SESSION['test'];
?>