internet explorer

Yes I have the same issue in mobile edge. I think it is could the cookies are being constructed. I updated the code as follows but you need PHP 7.3:

function samesite_setcookie($name, $value, array $options) {

	setcookie($name, $value, $options);
	$_COOKIE[$name] = $value;

/*
	$header = 'Set-Cookie:';
	$header .= rawurlencode($name) . '=' . rawurlencode($value) . ';';

	if (!empty($options['expires']) && $options['expires'] > 0) {
		$header .= 'expires=' . \gmdate('D, d-M-Y H:i:s T', (int) $options['expires']) . ';';
		$header .= 'Max-Age=' . max(0, (int) ($options['expires'] - time())) . ';';
	}

	$header .= 'path=' . rawurlencode($options['path']). ';';
	$header .= 'domain=' . rawurlencode($options['domain']) . ';';

	if (!empty($options['secure'])) {
		$header .= 'secure;';
	}
	$header .= 'httponly;';
	$header .= 'SameSite=' . rawurlencode($options['samesite']);

	header($header, false);
	$_COOKIE[$name] = $value;
*/

}