Fix #120: json-encode request when request header Content-Type is application/json and data is a multidimensional array

src/Curl/Curl.php

@@ -413,7 +413,15 @@ class Curl
     {
         if (is_array($data)) {
             if (self::is_array_multidim($data)) {
-                $data = self::http_build_multi_query($data);
+                if (isset($this->headers['Content-Type']) &&
+                    preg_match($this->json_pattern, $this->headers['Content-Type'])) {
+                    $json_str = json_encode($data);
+                    if (!($json_str === false)) {
+                        $data = $json_str;
+                    }
+                } else {
+                    $data = self::http_build_multi_query($data);
+                }
             } else {
                 $binary_data = false;
                 foreach ($data as $key => $value) {

tests/PHPCurlClass/PHPCurlClassTest.php

@@ -652,6 +652,17 @@ class CurlTest extends PHPUnit_Framework_TestCase
                     ),
                     '{"key":"value"}',
                 ),
+                array(
+                    array(
+                        'key' => 'value',
+                        'strings' => array(
+                            'a',
+                            'b',
+                            'c',
+                        ),
+                    ),
+                    '{"key":"value","strings":["a","b","c"]}',
+                ),
             ) as $test) {
             list($data, $expected_response) = $test;