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LetsEncrypt client library for ACME v2 written in PHP.

This library is inspired by yourivw/LEClient, completely rewritten and enhanced with some new features:

  • Support for Composer autoload (including separated Namespaces)
  • Automatic renewal process
  • Managed HTTP authentication process
  • Response caching mechanism
  • Prevents blocking while waiting for server results
  • Optional certificate feature "OCSP Must-Staple"
  • Optional set a preferred chain

The aim of this client is to make an easy-to-use and integrated solution to create a LetsEncrypt-issued SSL/TLS certificate with PHP.

Currently the authentication via HTTP is integrated. For that it is necessary, that you are able to place a redirect on the web server of the domain.

Current version

Tested with LetsEncrypt staging and production servers.

Transitioning to ISRG's Root:

This library supports it to set a preferred chain in Order::setPreferredChain($issuerCN)).

If the preferred chain is not set or set to IdenTrust’s chain, this library will try to use the IdenTrust’s chain as long as possible. Expected first date of NOT using the IdenTrust’s chain anymore for new certificate requests: June 30, 21


The minimum required PHP version is 7.1.

This client also depends on cURL and OpenSSL.

Getting Started

Install via composer:

composer require fbett/le_acme2

Also have a look at the LetsEncrypt documentation for more information and documentation on LetsEncrypt and ACME.

Example Integration

  1. Create a working directory. Warning: This directory will also include private keys, so i suggest to place this directory somewhere not in the root document path of the web server. Additionally this directory should be protected to be read from other web server users.
mkdir /etc/ssl/le-storage/
chown root:root /etc/ssl/le-storage
chmod 0600 /etc/ssl/le-storage
  1. Create a directory for the acme challenges. It must be reachable by http/https.
mkdir /var/www/acme-challenges
  1. Redirect specific requests to your acme-challenges directory

Example apache virtual host configuration:

<VirtualHost ...>
    <IfModule mod_rewrite.c>
        RewriteEngine On
        RewriteCond %{HTTPS} off
        RewriteRule \.well-known/acme-challenge/(.*)$$1 [R=302,L]
  1. Use the certificate bundle, if the certificate is issued:
if($order->isCertificateBundleAvailable()) {

    $bundle = $order->getCertificateBundle();
    $pathToPrivateKey = $bundle->path . $bundle->private;
    $pathToCertificate = $bundle->path . $bundle->certificate;
    $pathToIntermediate = $bundle->path . $bundle->intermediate;
    $order->enableAutoRenewal(); // If the date of expiration is closer than seven days, the order will automatically start the renewal process.

If a certificate is renewed, the path will also change.

My integrated workflow is the following:

  • User enables SSL to a specific domain in my control panel
  • The cronjob of this control panel will detect these changes and tries to create or get an order like in der HTTP-Sample.
  • The cronjob will fetch the information within the certificate bundle, if the certificate bundle is ready (mostly on the second run)
  • The cronjob will also build the Apache virtual host files and will restart the Apache2 service, if the new config file is different.

Please take a look on Samples\HTTP.php for a full sample workflow.

Known Issues

  • The DNS based authentication is not currently not implemented, so wildcard certificates can not be validated. All PR's are welcome.


This project is licensed under the MIT License - see the file for details.


LetsEncrypt client library for ACME v2 written in PHP.




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