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>
