Overview of ThinkPHP cache method S()_PHP tutorial

thinkPHP's F method can only be used to cache simple data types, and does not support validity periods and cached objects . The S() cache method supports validity period, also known as dynamic cache method. The usage examples are as follows:

Copy code The code is as follows:

// Use data identifier to cache $Data data
S('data',$Data) ; //The front is the cache mark, and the back is the cached data

Copy code The code is as follows:

// Cache $Data data 3600 seconds
S('data',$Data,3600);

Copy code The code is as follows:

//Delete cached data
S('data',NULL); //The first parameter is the cached identification name

Copy code The code is as follows:

$cache=S($cachename);//Set cache flag
// Determine whether there is a cache for this query
if(!$cache){ //$cache is the identifier of the cache (each query corresponds to a cache, that is, different queries have different caches)
$ cache=$video->where($map)->order($order)->limit($limit)->select();
foreach($cache as $key=>$value ){
$userlist=$user->where("id=".$value['user_id'])->find();
$cache[$key]["nickname"]= $userlist['nickname'];
}
S($cachename,$cache,3600); //Set cache survival time
}
S($cachename,NULL); // Delete cache

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