yii的简单片段缓存

$dependency = [
    'class' => 'yii\caching\DbDependency',
    'sql' => 'SELECT MAX(u_id) FROM user',
];
//设置片段缓存
if ($this->beginCache('goods',['duration'=>3600,'variations'=>[isset($_GET['page'])?$_GET['page']:1],'dependency'=>$dependency])){
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$this->endCache();
}