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vendor/yiisoft/yii2/caching/FileDependency.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\caching;
+
+use Yii;
+use yii\base\InvalidConfigException;
+
+/**
+ * FileDependency represents a dependency based on a file's last modification time.
+ *
+ * If the last modification time of the file specified via [[fileName]] is changed,
+ * the dependency is considered as changed.
+ *
+ * For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview).
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class FileDependency extends Dependency
+{
+    /**
+     * @var string the file path or [path alias](guide:concept-aliases) whose last modification time is used to
+     * check if the dependency has been changed.
+     */
+    public $fileName;
+
+
+    /**
+     * Generates the data needed to determine if dependency has been changed.
+     * This method returns the file's last modification time.
+     * @param CacheInterface $cache the cache component that is currently evaluating this dependency
+     * @return mixed the data needed to determine if dependency has been changed.
+     * @throws InvalidConfigException if [[fileName]] is not set
+     */
+    protected function generateDependencyData($cache)
+    {
+        if ($this->fileName === null) {
+            throw new InvalidConfigException('FileDependency::fileName must be set');
+        }
+
+        $fileName = Yii::getAlias($this->fileName);
+        clearstatcache(false, $fileName);
+        return @filemtime($fileName);
+    }
+}