AcmePhp\Ssl\Certificate::getPEM PHP Method

    public function getPEM()
    {
        return $this->certificatePEM;
    }

 /**
  * Parse the certificate.
  *
  * @param Certificate $certificate
  *
  * @return ParsedCertificate
  */
 public function parse(Certificate $certificate)
 {
     $rawData = openssl_x509_parse($certificate->getPEM());
     if (!is_array($rawData)) {
         throw new CertificateParsingException(sprintf('Fail to parse certificate with error: %s', openssl_error_string()));
     }
     if (!isset($rawData['subject']['CN'])) {
         throw new CertificateParsingException('Missing expected key "subject.cn" in certificate');
     }
     if (!isset($rawData['issuer']['CN'])) {
         throw new CertificateParsingException('Missing expected key "issuer.cn" in certificate');
     }
     if (!isset($rawData['serialNumber'])) {
         throw new CertificateParsingException('Missing expected key "serialNumber" in certificate');
     }
     if (!isset($rawData['validFrom_time_t'])) {
         throw new CertificateParsingException('Missing expected key "validFrom_time_t" in certificate');
     }
     if (!isset($rawData['validTo_time_t'])) {
         throw new CertificateParsingException('Missing expected key "validTo_time_t" in certificate');
     }
     $subjectAlternativeName = [];
     if (isset($rawData['extensions']['subjectAltName'])) {
         $subjectAlternativeName = array_map(function ($item) {
             return explode(':', trim($item), 2)[1];
         }, array_filter(explode(',', $rawData['extensions']['subjectAltName']), function ($item) {
             return false !== strpos($item, ':');
         }));
     }
     return new ParsedCertificate($certificate, $rawData['subject']['CN'], $rawData['issuer']['CN'], $rawData['subject'] === $rawData['issuer'], new \DateTime('@' . $rawData['validFrom_time_t']), new \DateTime('@' . $rawData['validTo_time_t']), $rawData['serialNumber'], $subjectAlternativeName);
 }