Does php redis store arrays?

PHP Redis is a popular key-value storage database, often used for caching and data storage. It supports a variety of data structures, including strings, hashes, lists, sets, and sorted sets. When using PHP Redis to store data, we often encounter some array type data, such as associative arrays and multidimensional arrays. So, does PHP Redis support storing arrays?

The answer is yes. PHP Redis supports storing array objects, but the array needs to be serialized into a string before it can be stored. PHP provides some built-in functions for serializing arrays into strings, such as serialize() and json_encode(). Among them, the serialize() function serializes an object into a string, and json_encode() encodes a PHP variable (array, object) into a string in JSON format. Although both functions can convert an array into a string, they do so in different ways. Therefore, when choosing which way to serialize an array, you need to decide based on your own needs.

When using PHP Redis to store an array, the following steps are generally required:

1. Serialize the array into a string

Use serialize() or The json_encode() function serializes an array into a string.

// 关联数组
$arr = array('name' => 'John', 'age' => 28);
$str = serialize($arr);

// 多维数组
$arr = array(
    'person1' => array('name' => 'John', 'age' => 28),
    'person2' => array('name' => 'Tom', 'age' => 30)
);
$str = json_encode($arr);

2. Storing strings to Redis

Use the set() function of Redis to store strings into Redis. You can choose a suitable key as the name of the storage array.

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

// 存储关联数组
$redis->set('person', serialize($arr));

// 存储多维数组
$redis->set('person_list', json_encode($arr));

3. Get the string from Redis and deserialize it into an array

Use the get() function of Redis to get the stored string from Redis and use The unserialize() or json_decode() function deserializes it into an array.

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

// 获取关联数组
$str = $redis->get('person');
$arr = unserialize($str);

// 获取多维数组
$str = $redis->get('person_list');
$arr = json_decode($str, true);

It should be noted that when using the json_decode() function, the second parameter needs to be set to true, which means that an array will be returned instead of an object. This ensures that the data obtained is in the correct format.

To sum up, PHP Redis can store arrays, but the array needs to be serialized into a string before storage. The process of using Redis to store an array is: serialize the array into a string -> Store the string in Redis -> Get the string from Redis and deserialize it into an array. When serializing an array, you can use the serialize() or json_encode() function. When deserializing an array, you can use the unserialize() or json_decode() function. You need to pay attention to setting the second parameter to true.

The above is the detailed content of Does php redis store arrays?. For more information, please follow other related articles on the PHP Chinese website!