Create cookies in php from iframe
In this post you will find the code to create cookies in iframe in php language
setcookie("variable_name", "variable_value", [
'expires' => time() + 86400,
'path' => '/',
'domain' => 'iframedomain.com',
'secure' => true,
'httponly' => true,
'samesite' => 'None',
]);