Day 20: Session in PHP
Session is a way to make data accessible on various pages of the website. Session stores on server and secure then the cookies.
Sessions are also used to store individual user data against a unique SessionId and SessionId can be used to share user information between pages requested. In session variable we can store string values as well as object.
session_start() function is used to start a function.
$_SESSION is a global variable to set the Session in PHP.
Program 59: Storing and Accessing Session Variables
session_start(); // Start the session
$_SESSION[“user”] = “Jhon”;
echo “Value in Session is “.$_SESSION[“user”];
?>
Program 60: Counter example with Session
session_start();
if( isset( $_SESSION[‘counter’] ) ) {
$_SESSION[‘counter’] += 1;
} else {
$_SESSION[‘counter’] = 1;
}
echo $_SESSION[‘counter’];
?>
Explanation:
isset() function is used to check if session variable is already set or not. In the above example every time you refresh the page counter value will get incremented.
Program 61: Destroy a PHP Session
session_start();
unset($_SESSION[‘counter’]); // unset a single session variable
session_unset(); // remove all session variables
session_destroy(); // destroy all the sessions
?>
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bestonetechnologies
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