How can you set a cookie in PHP and retrieve its value later?

To set a cookie in PHP, you can use the `setcookie()` function with parameters for the cookie name, value, expiration time, and path. To retrieve the cookie value later, you can access it through the `$_COOKIE` superglobal array. 

// Set a cookie with name 'user' and value 'John' that expires in 1 hour
setcookie('user', 'John', time() + 3600, '/');

// Retrieve the cookie value later
if(isset($_COOKIE['user'])){
    $user = $_COOKIE['user'];
    echo "Welcome back, $user!";
} else {
    echo "Cookie not set.";
}

Keywords

setcookie $_COOKIE cookie retrieval PHP web development

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