Let's talk about the F method related to cache reading in thinkphp

In the process of developing using the ThinkPHP framework, we often need to use caching.

ThinkPHP has many built-in caching methods, such as file, redis, memcached, etc. These cache methods have some common operation methods, such as writing, reading, deleting, etc.

Among these operation methods, the F method related to cache reading is widely used. This article mainly explains the application of F method in cache format.

1. F method overview

The F method is a simple cache reading method provided in the ThinkPHP framework, which can quickly read the specified cache data. The usage format of the F method is as follows:

$value = F($key);

Among them, $key represents the cache key name to be read, and $value represents the cache value read. The F method will automatically read the corresponding cache value based on $key and return it to the $value variable.

2. Cache format of F method

When using F method, we need to pay attention to the cache format. The format of the cache has a great influence on the execution efficiency of the F method, because the bottom layer of the F method will call the cache driver to read the cache. If the cache format is reasonable, the cache reading time can be effectively reduced.

Common cache formats include the following:

• Array format

Array format is a relatively common cache format, the format is:

array('key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3');

We can cache some data in the cache in the form of an array, and then use the F method to read the corresponding value based on the key name. For example:

$data = array('id'=>1, 'name'=>'张三', 'age'=>20);
cache('userinfo', $data, 3600);

// 读取缓存
$userinfo = F('userinfo');

• String format

String format is suitable for caching a single variable or object, the format is:

"value";

For example:

$data = 'Hello, World!';
cache('hello', $data, 3600);

// 读取缓存
$hello = F('hello');

• Boolean format

The Boolean format has only two values: true or false. The format is:

true/false;

For example:

$data = true;
cache('flag', $data, 3600);

// 读取缓存
$flag = F('flag');

• Object Format

The object format is suitable for caching complex objects. The format is:

O:类名:"属性";

where the class name is the class name of the object to be cached, and the attributes are the attributes of the object to be cached and its value.

For example:

// 定义对象
class Person {
    public $name;
    public $age;
    public function __construct($name, $age) {
        $this->name = $name;
        $this->age = $age;
    }
}

// 缓存对象
$data = new Person('张三', 20);
$cacheData = serialize($data);
cache('person', $cacheData, 3600);

// 读取缓存
$person = unserialize(F('person'));

3. Summary

The F method is a commonly used cache reading method in the ThinkPHP framework, which is easy and fast to use. When using the F method, you need to pay attention to the fact that the cache format has a great impact on the execution efficiency of the F method. You should choose the appropriate cache format based on the actual cache data format.

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