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A cookie is used to identify a user. A cookie is a small file that are saved 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.
Syntax setcookie(name, value, expire, path, domain, secure, httponly);
Note: Only the name parameter is required. All other parameters are optional.
The following example creates a cookie named "user" with the value "Nancy Sharma". The cookie will expire after 30 days (86400 * 30). The "/" path means that the cookie is available in entire website.
Then we can 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";
$cookie_value = "Nancy Sharma";
setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/");
?>
<html>
<body>
<?php
if(!isset($_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>
Note: The setcookie() function must appear BEFORE the <html> tag.
To modify a cookie, set the cookie again using the setcookie() function:
Example: Modify a Cookie
<?php
$cookie_name = "user";
$cookie_value = "Ritika";
setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/");
?>
<html>
<body>
<?php
if(!isset($_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:
Example: Delete a Cookie
<?php
// set the expiration date to one hour ago
setcookie("user", "", time() - 3600);
?>
<html>
<body>
<?php
echo "Cookie 'user' is deleted.";
?>
<body>
</html>
The following example checks whether cookies are enabled or not. First, try to create a test cookie with the setcookie() function, then count the $_COOKIE array variable:
Example: Check if Cookies are Enabled
<?php
setcookie("test_cookie", "test", time() + 3600, '/');
?>
<html>
<body>
<?php
if(count($_COOKIE) > 0) {
echo "Cookies are enabled.";
} else {
echo "Cookies are disabled.";
}
?>
<body>
<html>