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PhP Sessions
Jigar Makhija
Introduction
• When you work with an application, you open it, do some changes, and
then you close it.
• This is much like a Session.
• The computer knows who you are. It knows when you start the
application and when you end.
• But on the internet there is one problem: the web server does not know
who you are or what you do, because the HTTP address doesn't
maintain state.
• Session variables solve this problem by storing user information to be
used across multiple pages
• (e.g. username, favorite color, etc). By default, session variables last
until the user closes the browser.
session_start() function
E.g.
<?php
// Start the session
session_start();
?>
<!DOCTYPE html>
<html>
<body>
<?php
// Set session variables
$_SESSION["favcolor"] = "green";
$_SESSION["favanimal"] = "cat";
echo "Session variables are set.";
?>
</body>
</html>
demo_session1.php
Get PHP Session Variable Values
create another page called "demo_session2.php". From this page,you will access the session information
that you will set on the first page ("demo_session1.php").
demo_session2.php
<?php
session_start();
?>
<!DOCTYPE html>
<html>
<body>
<?php
// Echo session variables that were set on previous
page
echo "Favorite color is " . $_SESSION["favcolor"] .
".<br>";
echo "Favorite animal is " . $_SESSION["favanimal"]
. ".";
?>
Modify a PHP Session Variable
<?php
session_start();
?>
<!DOCTYPE html>
<html>
<body>
<?php
// to change a session variable, just overwrite it
$_SESSION["favcolor"] = "yellow";
print_r($_SESSION);
?>
</body>
</html>
Destroy a PHP Session
<?php
session_start();
?>
<!DOCTYPE html>
<html>
<body>
<?php
// remove all session variables
session_unset();
// destroy the session
session_destroy();
?>
</body>
</html>

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Php sessions

  • 2. Introduction • When you work with an application, you open it, do some changes, and then you close it. • This is much like a Session. • The computer knows who you are. It knows when you start the application and when you end. • But on the internet there is one problem: the web server does not know who you are or what you do, because the HTTP address doesn't maintain state. • Session variables solve this problem by storing user information to be used across multiple pages • (e.g. username, favorite color, etc). By default, session variables last until the user closes the browser.
  • 3. session_start() function E.g. <?php // Start the session session_start(); ?> <!DOCTYPE html> <html> <body> <?php // Set session variables $_SESSION["favcolor"] = "green"; $_SESSION["favanimal"] = "cat"; echo "Session variables are set."; ?> </body> </html> demo_session1.php
  • 4. Get PHP Session Variable Values create another page called "demo_session2.php". From this page,you will access the session information that you will set on the first page ("demo_session1.php"). demo_session2.php <?php session_start(); ?> <!DOCTYPE html> <html> <body> <?php // Echo session variables that were set on previous page echo "Favorite color is " . $_SESSION["favcolor"] . ".<br>"; echo "Favorite animal is " . $_SESSION["favanimal"] . "."; ?>
  • 5. Modify a PHP Session Variable <?php session_start(); ?> <!DOCTYPE html> <html> <body> <?php // to change a session variable, just overwrite it $_SESSION["favcolor"] = "yellow"; print_r($_SESSION); ?> </body> </html>
  • 6. Destroy a PHP Session <?php session_start(); ?> <!DOCTYPE html> <html> <body> <?php // remove all session variables session_unset(); // destroy the session session_destroy(); ?> </body> </html>