Added ability to cast response to str.

Author: denpamusic

Diff for: src/ResponseArrayTrait.php

@@ -271,6 +271,22 @@ public function __invoke($key = null)
         return $this->key($key);
     }
 
+    /**
+     * Converts response to string on current key.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        $value = $this->get();
+
+        if (is_array($value) || is_object($value)) {
+            return json_encode($value);
+        }
+
+        return (string) $value;
+    }
+
     /**
      * Constructs full key.
      *

Diff for: tests/BitcoindResponseTest.php

@@ -20,6 +20,22 @@ public function setUp()
         $this->response = $this->response->withHeader('X-Test', 'test');
     }
 
+    /**
+     * Test casting response to string.
+     *
+     * @return void
+     */
+    public function testResponseToString()
+    {
+        $response = $this->response;
+        $this->assertSame((string) $response('difficulty'), '1');
+        $this->assertSame((string) $response('confirmations'), '449162');
+        $this->assertSame(
+            (string) $response('tx'),
+            json_encode(self::$getBlockResponse['tx'])
+        );
+    }
+
     /**
      * Test response with result.
      *