更新内核，API接口开发的一些尝试，后期会增加API接口开发这块

core/library/think/Paginator.php

@@ -273,6 +273,23 @@ abstract class Paginator implements ArrayAccess, Countable, IteratorAggregate, J
         return $this->items->isEmpty();
     }
 
+    /**
+     * 给每个元素执行个回调
+     *
+     * @param  callable $callback
+     * @return $this
+     */
+    public function each(callable $callback)
+    {
+        foreach ($this->items as $key => $item) {
+            if ($callback($item, $key) === false) {
+                break;
+            }
+        }
+
+        return $this;
+    }
+
     /**
      * Retrieve an external iterator
      * @return Traversable An instance of an object implementing <b>Iterator</b> or
@@ -349,6 +366,7 @@ abstract class Paginator implements ArrayAccess, Countable, IteratorAggregate, J
             'total'        => $total,
             'per_page'     => $this->listRows(),
             'current_page' => $this->currentPage(),
+            'last_page'    => $this->lastPage,
             'data'         => $this->items->toArray(),
         ];
     }