What are common mistakes made when working with cookies in PHP?

Common mistakes when working with cookies in PHP include not setting the cookie before any output is sent to the browser, not properly escaping or validating the cookie data, and not using secure and HttpOnly flags for sensitive cookies. 

// Correct way to set a cookie with secure and HttpOnly flags
setcookie('user_id', $user_id, time() + 3600, '/', '', true, true);

Keywords

cookies PHP setcookie $_COOKIE expiration

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