Display request options in Curl::diagnose() output

Request options are now displayed when Curl::diagnose() is called and a
deferred constant curlOptionCodeConstants has been added.

src/Curl/Curl.php

@@ -99,6 +99,7 @@ class Curl
     private static $deferredProperties = [
         'curlErrorCodeConstant',
         'curlErrorCodeConstants',
+        'curlOptionCodeConstants',
         'effectiveUrl',
         'rfc2616',
         'rfc6265',
@@ -1517,6 +1518,7 @@ class Curl
         } else {
             $request_method = $this->getOpt(CURLOPT_CUSTOMREQUEST);
             $request_url = $this->getOpt(CURLOPT_URL);
+            $request_options_count = count($this->options);
             $request_headers_count = count($this->requestHeaders);
             $request_body_empty = empty($this->getOpt(CURLOPT_POSTFIELDS));
             $response_header_length = isset($this->responseHeaders['Content-Length']) ?
@@ -1525,6 +1527,36 @@ class Curl
                 strlen($this->rawResponse) : '(' . var_export($this->rawResponse, true) . ')';
             $response_headers_count = count($this->responseHeaders);
 
+            echo
+                'Request contained ' . $request_options_count . ' ' . (
+                    $request_options_count === 1 ? 'option:' : 'options:'
+                ) . "\n";
+            if ($request_options_count) {
+                $i = 1;
+                foreach ($this->options as $option => $value) {
+                    echo '    ' . $i . ' ';
+                    if (isset($this->curlOptionCodeConstants[$option])) {
+                        echo $this->curlOptionCodeConstants[$option] . ':';
+                    } else {
+                        echo $option . ':';
+                    }
+
+                    if (is_string($value)) {
+                        echo ' ' . $value . "\n";
+                    } elseif (is_int($value)) {
+                        echo ' ' . $value . "\n";
+                    } elseif (is_bool($value)) {
+                        echo ' ' . ($value ? 'true' : 'false') . "\n";
+                    } elseif (is_callable($value)) {
+                        echo ' (callable)' . "\n";
+                    } else {
+                        echo ' ' . gettype($value) . ':' . "\n";
+                        var_dump($value);
+                    }
+                    $i += 1;
+                }
+            }
+
             echo
                 'Sent an HTTP '   . $request_method . ' request to "' . $request_url . '".' . "\n" .
                 'Request contained ' . $request_headers_count . ' ' . (
@@ -1889,6 +1921,25 @@ class Curl
         return '';
     }
 
+    /**
+     * Get Curl Option Code Constants
+     *
+     * @access private
+     */
+    private function _get_curlOptionCodeConstants()
+    {
+        $constants = get_defined_constants(true);
+        $filtered_array = array_filter(
+            $constants['curl'],
+            function ($key) {
+                return strpos($key, 'CURLOPT_') !== false;
+            },
+            ARRAY_FILTER_USE_KEY
+        );
+        $curl_const_by_code = array_flip($filtered_array);
+        return $curl_const_by_code;
+    }
+
     /**
      * Get Effective Url
      *

tests/PHPCurlClass/PHPCurlClassTest.php

@@ -4108,6 +4108,7 @@ class CurlTest extends \PHPUnit\Framework\TestCase
             '--- Begin PHP Curl Class diagnostic output ---',
             'PHP Curl Class version: ' . Curl::VERSION,
             'PHP version: ' . PHP_VERSION,
+            'CURLOPT_HTTPGET: true',
             'Sent an HTTP GET request ',
             'Request contained no body.',
             'Received an HTTP status code of 401.',