diff --git a/library/think/Collection.php b/library/think/Collection.php
index 68097131..3f91b7cb 100644
--- a/library/think/Collection.php
+++ b/library/think/Collection.php
@@ -42,7 +42,7 @@ class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSeria
 
     public function toArray($allow = [])
     {
-        return array_map(function ($value) {
+        return array_map(function ($value) use ($allow) {
             return ($value instanceof Model || $value instanceof self) ? $value->toArray($allow) : $value;
         }, $this->items);
     }
@@ -225,11 +225,11 @@ class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSeria
 
         $result = [];
         foreach ($this->items as $row) {
-            $key    = $value    = null;
+            $key    = $value = null;
             $keySet = $valueSet = false;
             if (null !== $index_key && array_key_exists($index_key, $row)) {
                 $keySet = true;
-                $key    = (string) $row[$index_key];
+                $key    = (string)$row[$index_key];
             }
             if (null === $column_key) {
                 $valueSet = true;
@@ -344,8 +344,8 @@ class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSeria
     /**
      * 转换当前数据集为JSON字符串
      * @access public
-     * @param array     $allow 允许输出的属性列表
-     * @param integer   $options json参数
+     * @param array   $allow   允许输出的属性列表
+     * @param integer $options json参数
      * @return string
      */
     public function toJson($allow = [], $options = JSON_UNESCAPED_UNICODE)
@@ -369,6 +369,6 @@ class Collection implements ArrayAccess, Countable, IteratorAggregate, JsonSeria
         if ($items instanceof self) {
             return $items->all();
         }
-        return (array) $items;
+        return (array)$items;
     }
 }