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vendor/yiisoft/yii2/caching/CallbackDependency.php

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+<?php
+/**
+ * @link https://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license https://www.yiiframework.com/license/
+ */
+
+namespace yii\caching;
+
+/**
+ * CallbackDependency represents a dependency based on the result of a callback function.
+ *
+ * Callback function should return a value that serves as the dependency data.
+ *
+ * For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview).
+ *
+ * @author Vlad Varlamov <vlad@varlamov.dev>
+ * @since 2.0.50
+ */
+class CallbackDependency extends Dependency
+{
+    /**
+     * @var callable the PHP callback that will be called to determine if the dependency has been changed.
+     */
+    public $callback;
+
+
+    /**
+     * Generates the data needed to determine if dependency has been changed.
+     * This method returns the result of the callback function.
+     * @param CacheInterface $cache the cache component that is currently evaluating this dependency
+     * @return mixed the data needed to determine if dependency has been changed.
+     */
+    protected function generateDependencyData($cache)
+    {
+        return ($this->callback)();
+    }
+}