title: cURL Error #:Unknown cipher in list: tls_ecdhe_rsa_with_aes_256_cbc_sha
body: <p>I have received this error when I execute code:</p>
  
  <blockquote>
    <p>cURL Error #:Unknown cipher in list: tls_ecdhe_rsa_with_aes_256_cbc_sha</p>
  </blockquote>
  
  <p><strong>curl version:7.56.1</strong></p>
  
  <pre><code> $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $url);
   curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
   curl_setopt($ch, CURLOPT_SSLVERSION,3); 
   curl_setopt($ch, CURLOPT_HEADER, false);
   curl_setopt($ch, CURLOPT_SSL_CIPHER_LIST, 'tls_ecdhe_rsa_with_aes_256_cbc_sha');
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
   curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
   curl_setopt($ch, CURLOPT_VERBOSE,true);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
   $xml = curl_exec($ch);
   $err = curl_error($ch);
   curl_close($ch);
   $xmls = trim($xml);
   echo $xmls;
   echo "cURL Error #:" . $err;
  </code></pre>
  
  <p>How to solve this problem? And how to add or enable cipher <code>tls_ecdhe_rsa_with_aes_256_cbc_sha</code>?</p>