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  • DIFFERENCE BETWEEN SESSION AND COOKIE

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    SESSION-

    A session contains user information on server side. When a user opens a page, then the information is first transferred to the server, then php will match that information to the server-side cookie.

    If the browser is closed once, all the data in the session will be lost. On re-opening the browser a new session will start. To maintain the data $_SESSION super global variable is used.

    Advantages-

    • Ability to store large amount of data.
    • Secure because data is stored on the server side.
    • Can store objects and string both.

    Disadvantages-

    • All data is lost when browser is closed.
    • Depend on cookie.

    Creating a session:

    <?php session_start(); ?>

    Setting value:

    <?php $_SESSION[first_name] = Neha; ?>

    Reading value:

    <?php echo $_SESSION[first_name]; ?>

    Removing data:

    <?php unset($_SESSION[first_name]); ?>

    Ending session:

    <?php session_destroy(); ?>

     

    COOKIE-

    A cookie contains user information in the client side. $_COOKIE superglobal stores the value, which is read by the php.

    There is no need to store cookie, it remains stored in our system.

    Advantages-

    • Cookie remains stored if the browser is closed.

    Disadvantages-

    • Limited amount of data can be stored.
    • Stored in client side, so user can view it.

     

    Creating a cookie:

    <?php
        if (!isset($_COOKIE['Ordering'])) {
            setcookie("Ordering", $_POST['ChangeOrdering'], time() + 31536000);
        }
    ?>

     

    Using a cookie:

    <?php
        echo (isset($_COOKIE[ordering])) ? $_COOKIE[ordering] : cookie value not set;
    ?>

     

    Deleting a cookie:

    <?php setcookie(favorite_color); ?>

     

     

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