Explore whether ThinkPHP's Session supports storing arrays?

When writing web applications using the ThinkPHP framework, it is often necessary to use Session to store and process user login status, shopping cart information and other data, and sometimes it is necessary to store a set of data in the form of an array into Session for convenience. Subsequent calls and processing. So, does ThinkPHP's Session support storing arrays? Let’s explore this next.

First of all, we need to understand that in the ThinkPHP framework, Session has a variety of storage methods to choose from, such as file storage, database storage, Redis storage, etc. Different storage methods have different levels of support for Session storage arrays, so we need to choose an appropriate Session storage method based on the actual situation.

Taking the file storage method as an example, we can view the Session driver class in the ThinkPHP framework, located in the "think\session\driver" directory. There are multiple Session driver class files in this directory. Taking "File Driver Class" as an example, the file is "File.php".

In the "File.php" file, we can see the following code snippet:

if ($this->config['expire'] > 0) {
    $content = time() + $this->config['expire'] . "\n" . $content;
}
if (!is_dir($this->config['path'])) {
    mkdir($this->config['path'], 0755, true);
}
if (!is_writable($this->config['path'])) {
    throw new \think\Exception('session path not writeable: ' . $this->config['path']);
}
$file = $this->config['path'] . DIRECTORY_SEPARATOR . 'sess_' . $sessionId;
file_put_contents($file, $content);

The above code stores the Session data in the server in the form of a file, where $content is String after data serialization. Since strings can store various data types, we can store arrays directly into Session. For example:

// 存储数组到Session中
session('cart', ['apple', 'banana', 'pear']);

// 从Session中读取数组
$cart = session('cart');

In the database storage method and Redis storage method, arrays can also be stored in the Session. For example, you can use the Redis storage method as follows:

// 存储数组到Session中
$redis->set('cart', json_encode(['apple', 'banana', 'pear']));

// 从Session中读取数组
$cart = json_decode($redis->get('cart'), true);

It should be noted that when storing an array in Session, you need to use json_encode() to serialize the array, and use json_decode() to decode the data when reading. Deserialize.

To sum up, ThinkPHP’s Session very much supports storing arrays. Whether using file, database or Redis storage methods, as long as we serialize the array and store it in the Session, we can easily store multiple data in one variable to facilitate subsequent reading and processing. Of course, when using Session to store arrays, you also need to pay attention to operations such as clearing and updating the array to ensure the consistency and correctness of the data. This is an issue that we must pay attention to when writing Web applications.

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