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W e b t u t o r i a l s

Define PHP

PHP Installation

PHP INI File

PHP Case Sensitivity

PHP Variable

PHP Echo & Print

PHP Operators

PHP Receiving Input

PHP Decision Making

PHP Loops

PHP Jumping Statement

PHP Image Gallery

PHP Arrays

PHP Date Functions

PHP String Functions

PHP Math Functions

PHP Functions

PHP Variable Scope

PHP Constant Variable

PHP Superglobals

PHP Form Validation

PHP Include Statement

PHP Filter

PHP File Handling

PHP File Upload

PHP Cookies

PHP Session

PHP Send Emails

PHP Captcha

PHP-MySQL Connectivity

PHP MySQL Select

PHP MySQL Insert

PHP MySQL Delete

PHP MySQL Update

PHP Cookies

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.

PHP Create/Retrieve a Cookie

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.

Modify a Cookie Value

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>

Delete a Cookie

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>

Check if Cookies are Enabled

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>