$redirect_uri = 'https://' . $_SERVER['HTTP_HOST']; //Base url

//Test 1: Set redirect URI for first page
$client->setRedirectUri($redirect_uri.'/test1.php');
$client->setScopes('email');
echo('Validate setting URI 1: '.$client->getRedirectUri());
PHP_EOL;

$auth_url = $client->createAuthUrl();
echo('Generated Auth URL: '.$auth_url);
PHP_EOL;

//Test 2: Set redirect URI for second page
$client->setRedirectUri($redirect_uri.'/test2.php');
echo('Validate setting URI 2: '.$client->getRedirectUri());
PHP_EOL

$auth_url2 = $client->createAuthUrl();
echo('Generated Auth2 URL: '.$auth_url2);