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This article introduces the relevant knowledge of "how to use the f () method in thinkphp5". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

In thinkphp5, f method is used for simple data cache, and can only support file form, but not cache validity period. It can be regarded as a subset function of s method, which uses PHP return mode, so it is more efficient than s method.

This article operating environment: Windows10 system, ThinkPHP5 version, Dell G3 computer.

How to use the f () method in thinkphp5

We have understood the usage of S method in ThinkPHP. F method is actually a subset of S method, which is only used for simple data caching, and can only support file form, not cache validity. Because the PHP return method is used, it is more efficient than S method, so we also call it fast caching method.

The characteristics of F method are:

Simple data caching

Save in file form

Load cache by returning data from PHP

Support for subdirectory caching and automatic creation

Support for cache deletion and batch deletion

Write and read cach

F ('data','test data')

The default save starting path is DATA_PATH (this constant is located under RUNTIME_PATH.'Data/' by default), which means that a cache file with the file name DATA_PATH.'data.php' is generated.

Note: make sure your cache identity is unique to avoid data overwriting and conflicts.

The next time you read the cached data, use:

$Data = F ('data')

We can save it as a subdirectory, for example:

F ('user/data',$data); / / cache write F (' user/data'); / / read cache

A DATA_PATH.'user/data.php' cache file is generated, which is automatically created if the user subdirectory does not exist, or multi-level subdirectories can be supported, such as:

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

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

F ('data',$data,TEMP_PATH)

When you get it, you need to use:

F ('data','',TEMP_PATH)

Delete cach

Deleting the cache is also easy, using:

F ('data',NULL)

When the second parameter is passed in NULL, the data cache identified as data is deleted.

Batch deletion is supported, especially in the case of caching for subdirectories. If we want to delete all cached data under the usersubdirectory, we can use:

F ('user/*',NULL)

Or use filter criteria to delete, for example:

F ('user/ [^ a] *', NULL); "how to use the f () method in thinkphp5" ends here. Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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