How to use the f() method in thinkphp5

In thinkphp5, the f method is used for simple data caching, and can only support file form and does not support cache validity period. It can be regarded as a subset of the s method, using the PHP return method. Therefore, the efficiency is higher than the S method.

The operating environment of this article: Windows 10 system, ThinkPHP version 5, Dell G3 computer.

How to use the f() method in thinkphp5

We have already understood the usage of the S method in ThinkPHP. The F method is actually a subset of the S method and is only used for simple data caching. , and can only support file form and does not support cache validity period. Because it uses the PHP return method, its efficiency is higher than the S method, so we also call it the fast cache method.

The characteristics of the F method are:

• Simple data caching;

• Save in file form;

• Use PHP to return data to load the cache;

• Supports subdirectory caching and automatic creation;

• Supports deletion of cache and Batch deletion;

Write and read cache

F('data','test data');

The default saving starting path is DATA_PATH (this constant is located in RUNTIME_PATH in the default configuration .'Data/'), which means that a cache file named DATA_PATH.'data.php' will be generated.

Note: Make sure your cache identifier is unique to avoid data overwriting and conflicts.

The next time you read cached data, use:

$Data = F('data');

We can save it in a subdirectory, for example:

F('user/data',$data); // 缓存写入
F('user/data'); // 读取缓存

will generate DATA_PATH.'user/data .php' cache file, if the user subdirectory does not exist, it will be created automatically. It can also support multi-level subdirectories, for example:

F('level1/level2/data',$data);

If you need to specify the starting directory of the cache, you can use the following method :

F('data',$data,TEMP_PATH);

When obtaining, you need to use:

F('data','',TEMP_PATH);

Delete cache

Deleting cache is also very simple, use:

F('data',NULL);

The second parameter is passed Entering NULL means deleting the data cache identified as data.

Supports batch deletion function, especially for subdirectory cache. Suppose we want to delete all cached data under the user subdirectory. We can use:

F('user/*',NULL);

or use filter conditions to delete, For example:

F('user/[^a]*',NULL);

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