add files

src/Illuminate/Support/HigherOrderCollectionProxy.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace Illuminate\Support;
+
+class HigherOrderCollectionProxy
+{
+    /**
+     * The collection being operated on.
+     *
+     * @var \Illuminate\Support\Collection
+     */
+    protected $collection;
+
+    /**
+     * The method being proxied.
+     *
+     * @var string
+     */
+    protected $method;
+
+    /**
+     * Create a new proxy instance.
+     *
+     * @param  \Illuminate\Support\Collection  $collection
+     * @param  string  $method
+     * @return void
+     */
+    public function __construct(Collection $collection, $method)
+    {
+        $this->method = $method;
+        $this->collection = $collection;
+    }
+
+    /**
+     * Proxy accessing an attribute onto the collection items.
+     *
+     * @param  string  $key
+     * @return mixed
+     */
+    public function __get($key)
+    {
+        return $this->collection->{$this->method}(function($value) use ($key) {
+            return $value->{$key};
+        });
+    }
+
+    /**
+     * Proxy a method call onto the collection items.
+     *
+     * @param  string  $method
+     * @param  array  $parameters
+     * @return mixed
+     */
+    public function __call($method, $parameters)
+    {
+        return $this->collection->{$this->method}(function($value) use ($method, $parameters) {
+            return $value->{$method}(...$parameters);
+        });
+    }
+}