What best practices should be followed when setting and checking cookies in PHP to avoid issues like this?

Issue: To avoid potential security vulnerabilities and ensure proper functionality, it is important to set and check cookies securely in PHP. This includes setting appropriate parameters such as the expiration time, domain, and secure flag, as well as validating and sanitizing cookie values to prevent injection attacks. 

// Set a cookie with secure parameters
setcookie('cookie_name', 'cookie_value', time() + 3600, '/', 'example.com', true, true);

// Check if the cookie exists and has a valid value
if(isset($_COOKIE['cookie_name']) && !empty($_COOKIE['cookie_name'])) {
    // Process the cookie value
    $cookie_value = $_COOKIE['cookie_name'];
} else {
    // Handle the case when the cookie is not set or has an invalid value
}

Keywords

cookies PHP setcookie $_COOKIE security

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