How can the session_start() function impact the ability to delete cookies using unset() and setcookie() in PHP?

When the session_start() function is called in PHP, it automatically sends a cookie to the browser to store the session ID. This can interfere with the ability to delete cookies using unset() and setcookie() because the session cookie takes precedence over other cookies. To solve this issue, you can use session_destroy() to destroy the session and unset the session cookie before attempting to delete other cookies. 

<?php
// Start the session
session_start();

// Destroy the session
session_destroy();

// Unset the session cookie
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]
    );
}

// Unset other cookies
unset($_COOKIE['cookie_name']);
setcookie('cookie_name', '', time() - 3600, '/');
?>

Keywords

session_start unset setcookie cookies PHP

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