Detailed explanation of thinkphp f method

thinkphp The f method is a subset of the S method. It is only used for simple data caching, and can only support file formats and does not support cache validity periods. Its usage syntax is such as "F('data','test data');".

#The operating environment of this article: Windows 7 system, thinkphp v5.1 version, Dell G3 computer.

Detailed explanation of the ThinkPHP function: F method

We have already understood the usage of the S method in ThinkPHP. The F method is actually a subset of the S method. It only uses It is a simple data cache, and can only support file formats and does not support cache validity. Because it uses 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;

• Support cache deletion and batch deletion;

Write and read cache

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

The default saving starting path is DATA_PATH (the The constant is located under RUNTIME_PATH.'Data/' in the default configuration), which means that a cache file with the file name 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);

Passing NULL into the second parameter 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);

Recommended learning: "The latest 10 thinkphp video tutorials"

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