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Small utility library that lets you find a path to the system CA bundle, and includes a fallback to the Mozilla CA bundle.

Originally written as part of composer/composer, now extracted and made available as a stand-alone library.


Install the latest version with:

$ composer require composer/ca-bundle


  • PHP 5.3.2 is required but using the latest version of PHP is highly recommended.

Basic usage


  • CaBundle::getSystemCaRootBundlePath(): Returns the system CA bundle path, or a path to the bundled one as fallback
  • CaBundle::getBundledCaBundlePath(): Returns the path to the bundled CA file
  • CaBundle::validateCaFile($filename): Validates a CA file using openssl_x509_parse only if it is safe to use
  • CaBundle::isOpensslParseSafe(): Test if it is safe to use the PHP function openssl_x509_parse()
  • CaBundle::reset(): Resets the static caches

To use with curl

$curl = curl_init("");

$caPathOrFile = \Composer\CaBundle\CaBundle::getSystemCaRootBundlePath();
if (is_dir($caPathOrFile)) {
    curl_setopt($curl, CURLOPT_CAPATH, $caPathOrFile);
} else {
    curl_setopt($curl, CURLOPT_CAINFO, $caPathOrFile);

$result = curl_exec($curl);

To use with php streams

$opts = array(
    'http' => array(
        'method' => "GET"

$caPathOrFile = \Composer\CaBundle\CaBundle::getSystemCaRootBundlePath();
if (is_dir($caPathOrFile)) {
    $opts['ssl']['capath'] = $caPathOrFile;
} else {
    $opts['ssl']['cafile'] = $caPathOrFile;

$context = stream_context_create($opts);
$result = file_get_contents('', false, $context);

To use with Guzzle

$client = new \GuzzleHttp\Client([
    \GuzzleHttp\RequestOptions::VERIFY => \Composer\CaBundle\CaBundle::getSystemCaRootBundlePath()


composer/ca-bundle is licensed under the MIT License, see the LICENSE file for details.