Software⏱️ 2 min read📅 2026-05-31

How to Fix: PHP - SSL certificate error: unable to get local issuer certificate

PHP SSL certificate error: unable to get local issuer certificate solution.

Quick Answer: Verify that the cacert.pem file is correctly located and accessible in your php.ini file.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The 'unable to get local issuer certificate' error occurs when your system cannot verify the identity of a website. In this case, it's related to the SSL certificate used by Mandrill API.

🛑 Root Causes of the Error

  • Outdated or corrupted SSL certificate.
  • Lack of a trusted CA file in PHP configuration.

✅ Best Solutions to Fix It

Method 1: Update CA Certificate

  1. Step 1: Open the curl_init() function in PHP, and set the CA file using the following code: `curl_setopt($ch, CURLOPT_CAINFO, 'C: ginx iles rust.crt');` Replace 'C: ginx iles rust.crt' with the actual path to your trust certificate.

Method 2: Use Windows Built-in CA Certificate

  1. Step 1: Download and install the Windows 10 default security policies from Microsoft.

💡 Conclusion

By updating your CA certificate or using the Windows built-in one, you should be able to resolve the 'unable to get local issuer certificate' error and successfully use Mandrill API.

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