Update array merge fix issue with overwriting.

src/Parser.php

@@ -35,9 +35,10 @@ public function only($keys)
 
         $results = array();
         foreach ($keys as $key) {
-            $results = array_merge($results, $this->_buildArray(explode('.', $key), $this->get($key)));
+            $results = array_merge_recursive($results, $this->_buildArray(explode('.', $key), $this->get($key)));
         }
 
+        var_dump($results);
         return $results;
     }
 

tests/ParserPHPTest.php

@@ -35,6 +35,7 @@ public function return_value_for_multi_level_key()
         $this->assertEquals(array('id' => 123, 'note' => array('headers' => array('from' => '[email protected]'), 'body' => 'Hello World')), $parser->except('note.headers.to'));
         $this->assertEquals(array('id' => 123, 'note' => array('headers' => array('to' => '[email protected]', 'from' => '[email protected]'))), $parser->except('note.body'));
 
+        $this->assertEquals(array('note' => array('headers' => array('to' => '[email protected]', 'from' => '[email protected]'))), $parser->only('note.headers.to', 'note.headers.from'));
         $this->assertEquals(array('id' => 123, 'status' => null, 'note' => array('body' => 'Hello World')), $parser->only('note.body', 'id', 'status'));
     }