Shopify PHP API - FileSessionStorage issue

require_once ‘vendor/autoload.php’;
include ‘config.php’;

use Shopify\Auth\OAuthCookie;
use Shopify\Context;
use Shopify\Client;
use Shopify\Auth;
use Shopify\Auth\FileSessionStorage;

Context::initialize(
apiKey: $apiKey,
apiSecretKey: $apiSecret,
scopes: $scope,
hostName: $shopName ,
sessionStorage: new FileSessionStorage(DIR.‘/tmp/php_sessions’),
apiVersion: ‘2023-04’,
isEmbeddedApp: true,
isPrivateApp: false,
);

getting this error:

Parse error: syntax error, unexpected identifier “string”, expecting variable in …shopify-apps\src\Auth\FileSessionStorage.php on line 12

this s the function in FileSessionStorage.php :

public function __construct(string $path = ‘/tmp/shopify_api_sessions’)
{
if (!is_dir($path)) {
mkdir($path);
}

$this->path = $path;
}

Can anyone help with fixing this.. tried this too
SessionStorage: new FileSessionStorage(‘/tmp/php_sessions’),