LERAN PHP COMPLETE

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Cookies


A cookie is often used to identify a user.


What is a Cookie?

A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too. With PHP, you can both create and retrieve cookie values.


Create Cookies With PHP

A cookie is created with the setcookie() function.

setcookie(name, value, expire, path, domain, secure, httponly);

Only the name parameter is required. All other parameters are optional.

PHP Create/Retrieve a Cookie

The following example creates a cookie named "user" with the value "John Doe". The cookie will expire after 30 days (86400 * 30). The "/" means that the cookie is available in entire website (otherwise, select the directory you prefer).

We then retrieve the value of the cookie "user" (using the global variable $_COOKIE). We also use the isset()function to find out if the cookie is set:

<?php
    $cookie_name = "user";
    $cookie_value = "Suresh chand";
    
    setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); /* 86400 = 1 day  */
?>

<html>
    <body>
        <?php
            if(!isset($_COOKIE[$cookie_name])) {
                echo "Cookie named '" . $cookie_name . "' is not set!";
            } else {
                echo "Cookie '" . $cookie_name . "' is set!<br>";
                echo "Value is: " . $_COOKIE[$cookie_name];
            }
        ?>
    </body>
</html>

Delete a Cookie

To delete a cookie, use the setcookie() function with an expiration date in the past:

<?php
    // set the expiration date to one hour ago 
    setcookie("user", "", time() - 3600);
?>

<html>
    <body>
        <?php
            echo "Cookie 'user' is deleted.";
        ?>
    </body>
</html>

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