perf: 增加原生缓存

vendor/nesbot/carbon/src/Carbon/CarbonPeriodImmutable.php

@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * This file is part of the Carbon package.
+ *
+ * (c) Brian Nesbitt <brian@nesbot.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Carbon;
+
+class CarbonPeriodImmutable extends CarbonPeriod
+{
+    /**
+     * Date class of iteration items.
+     *
+     * @var string
+     */
+    protected $dateClass = CarbonImmutable::class;
+
+    /**
+     * Prepare the instance to be set (self if mutable to be mutated,
+     * copy if immutable to generate a new instance).
+     *
+     * @return static
+     */
+    protected function copyIfImmutable()
+    {
+        return $this->constructed ? clone $this : $this;
+    }
+}