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A cookie is often used to identify a user.
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.
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.
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>
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>