Analogic\ACME\Lescript::generateCSR PHP Method

    private function generateCSR($privateKey, array $domains)
    {
        $domain = reset($domains);
        $san = implode(",", array_map(function ($dns) {
            return "DNS:" . $dns;
        }, $domains));
        $tmpConf = tmpfile();
        $tmpConfMeta = stream_get_meta_data($tmpConf);
        $tmpConfPath = $tmpConfMeta["uri"];
        // workaround to get SAN working
        fwrite($tmpConf, 'HOME = .
RANDFILE = $ENV::HOME/.rnd
[ req ]
default_bits = 2048
default_keyfile = privkey.pem
distinguished_name = req_distinguished_name
req_extensions = v3_req
[ req_distinguished_name ]
countryName = Country Name (2 letter code)
[ v3_req ]
basicConstraints = CA:FALSE
subjectAltName = ' . $san . '
keyUsage = nonRepudiation, digitalSignature, keyEncipherment');
        $csr = openssl_csr_new(array("CN" => $domain, "ST" => $this->state, "C" => $this->countryCode, "O" => "Unknown"), $privateKey, array("config" => $tmpConfPath, "digest_alg" => "sha256"));
        if (!$csr) {
            throw new \RuntimeException("CSR couldn't be generated! " . openssl_error_string());
        }
        openssl_csr_export($csr, $csr);
        fclose($tmpConf);
        $csrPath = $this->getDomainPath($domain) . "/last.csr";
        file_put_contents($csrPath, $csr);
        return $this->getCsrContent($csrPath);
    }