PHP / Guzzle6 code to check client TLS version

chk_ssl.php

<?php
require_once 'vendor/autoload.php';

function hows_my_ssl()
{
    $target = "https://www.howsmyssl.com/a/check";
    $client = new \GuzzleHttp\Client(['http_errors' => false]);
    $res = $client->request("GET", $target);
    echo $res->getStatusCode() . PHP_EOL;
    var_dump(json_decode($res->getBody(), false));
}

hows_my_ssl();