What is the usage of php memcached?

php memcached usage: 1. Start Memcached; 2. Use the ps command to check the running status; 3. Create a Memcached object; 4. Add data through the add and get methods.

The operating environment of this article: Windows7 system, PHP7.1 version, DELL G3 computer

What is the usage of php memcached?

Use PHP to simply operate Memcached:

Remember to start Memcached first!

[root@localhost ~]# /usr/bin/memcached -d -l 127.0.0.1 -p 11211 -m 150 -u root

-d daemon mode (leave the program still running after exiting the terminal window), -l specifies the IP address 127.0.0.1, -p specifies the port number 11211, -m how much memory is allocated for memcached (unit: M), -u specifies which user to use to start memcached

Use the ps command to check the running status:

[root@localhost ~]# ps -ef | grep memcached

Shows successful operation !
Next, start using PHP to operate Memcached!

1. Create a Memcached object

$m = new Memcached();

2. Pass in one or more servers

//传入一台服务器
$m->addServer('127.0.0.1','11211');
//传入多台服务器
$servers = array(
    array('127.0.0.1','11211'),
    array('127.0.0.2','11211')
);

$m->addServers($servers);
//查看一下运行状态
print_r($m->getStats());

Because the second server passed in does not exist, the correct information cannot be obtained.
You can also use getVersion() to directly obtain the version information of memcached.

3.add() method and get() method

/*
 * add()
 * key代表加入缓存的key值
 * value代表加入缓存的value值
 * 600代表这条缓存的生效时间为600秒，0代表永久生效 */$m->add('key','value',600);/*
 * get()
 * 通过key值来获取缓存 */echo "缓存key值：".$m->get('key);

If I am in the first add( ) method and add another one below:

$m->add('key','value1',600);

In fact, this will not overwrite the previous value. If you want to overwrite it, you can use the replace() method

##4. replace() method

$m->add('key','value',600);
$m->replace('key','value11',600);

In this way, when we get('key') again, we will get value11.

5.set() method The set() method actually integrates the add method and replace method. If the key value of set does not exist, it will It is equivalent to the add method. If the key value of the set already exists, it is equivalent to the replace method, so the set method is generally the most commonly used method.

$m->set('key','value',600);

6.delete() method

Method to delete the cache, usage method:

/*
 * delete()
 * 传入一条缓存的key */$m->delete('key');

Add the cache invalidation I added above The time has not yet come. After executing the delete method, we still cannot obtain this cache.

7.flush() method Clear all caches directly! (Use with caution!!!)

8.increment() method

Addition operation, usage method:

//设置一条key值为num，value为5，永久生效的缓存
$m->set('num',5,0);
//没刷新一次页面key值为num的缓存value加5
$m->increment('num',5);
//输出这条缓存
echo $m->get('num');

9.decrement () method is similar to the increment() method, except that it becomes subtraction. The specific usage method is the same as the increment() method.

Use the Memcached method more elegantly

10.setMulti() method If you always follow the previous method for set caching, Saving items one by one is very slow, so Memcached provides us with the setMulti() method. The usage method is as follows:

//首先定义要存入缓存的数组
$data = array(    'key1'=>'value1',    'key2'=>'value2');
/*
 * setMulti()
 * 第一个参数代表传入的数组，第二个参数代表生效时间，0代表永久 */
 $m->setMulti($data,0);

11.getMulti() method also obtains the cache You can also obtain multiple caches at one time. The usage method is as follows:

//定义获取缓存的key值得数组
$get = array('key1','key2');
/*
 * getMulti()
 * 传入需要获取缓存的key值 */
 $result = $m->getMulti($get);
var_dump($result);

12.deleteMulti() method is similar to the getMulti() method. It's just to delete the cache. The usage method is as follows:

$delete = array('key1','key2');
$m->deleteMulti($delete);

At this time, the cache with key values ​​​​of key1 and key2 will be deleted.

13.getResultCode() method After I perform an operation, I can use this method to view the execution status. The usage method is as follows:

//刚才我执行了deleteMulti()方法，这时候我可以使用getResultCode()方法来查看操作是否成功
echo $m->getResultCode();

When When executed correctly, 0 will be returned;

For more status codes, please click: More status codes

14. The difference between the getResultMessage() method and the getResultCode() method Yes, getResultCode() returns the status code, and the getResultMessage() method returns specific information. The usage method is as follows:

//上面执行deleteMulti()方法
$m->getResultMessage();

This is a SUCCESS message returned, telling us that the operation was successful. For specific return information, please refer to the more status code links above!

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