Verify curl ssl connections with php

testtls.php

<?php
/*
This script tests whether your php installation is able to create TLS connections.
*/
foreach ([6, 7, 8] as $version) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "https://tlstest.paypal.com/");
    curl_setopt($ch, CURLOPT_SSLVERSION, $version);
    var_dump(curl_exec($ch));
    var_dump(curl_error($ch));
}