perf: 增加原生缓存

vendor/nesbot/carbon/src/Carbon/Exceptions/UnknownUnitException.php

@@ -0,0 +1,48 @@
+<?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\Exceptions;
+
+use Throwable;
+
+class UnknownUnitException extends UnitException
+{
+    /**
+     * The unit.
+     *
+     * @var string
+     */
+    protected $unit;
+
+    /**
+     * Constructor.
+     *
+     * @param string         $unit
+     * @param int            $code
+     * @param Throwable|null $previous
+     */
+    public function __construct($unit, $code = 0, Throwable $previous = null)
+    {
+        $this->unit = $unit;
+
+        parent::__construct("Unknown unit '$unit'.", $code, $previous);
+    }
+
+    /**
+     * Get the unit.
+     *
+     * @return string
+     */
+    public function getUnit(): string
+    {
+        return $this->unit;
+    }
+}