Update ProcessInstance.php

Author: wertmenschen

src/Models/ProcessInstance.php

@@ -19,9 +19,19 @@ public function setVariable($key, $value, $type = 'String')
             'value' => $value
         ]);
     }
+    
+    public function getVariable($key)
+    {
+        return $this->get('variables/' . $key);
+    }
+
+    public function getVariables()
+    {
+        return get_object_vars($this->get('variables'));
+    }
 
     public function ended()
     {
         return $this->get('history/process-instance/?processInstanceId=' . $this->id)[0]->state == 'COMPLETED';
     }
-}
+}