PHP ZeroSSL Client For any project integration, not CLI
You can check example.php it's easy to use.
<?php
require "zerossl.php";
$api = new ZeroSSLAPI("7b5a1f142db51537453685e0cc544f0c",true);
print_r($api->order_cert("example.com", file_get_contents("csr.txt")));
print_r($api->get_certs());
print_r($api->get_certs('example.com'));
print_r($api->get_cert('56f43f950c292a6f14440d5740'));
print_r($api->get_challenges('56f43f950c292a6f14440d5740'));
print_r($api->send_challenges('56f43f950c292a6f14440d5740'));
print_r($api->get_cert_content('56f43f950c292a6f14440d5740'));
print_r($api->cancel_cert('56f43f950c292a6f14440d5740'));
print_r($api->revoke_cert('56f43f950c292a6f14440d5740'));