How to close mongodb database connection in php7

When using PHP to connect to the MongoDB database, you usually need to open and close the connection in code. When connecting to a MongoDB database using PHP 7, some developers may not know how to close the connection. Below, I will show you how to close the connection when connecting to a MongoDB database using PHP 7.

1. Why should we close the connection?

When using the MongoDB database, you need to establish a connection with the database every time you access data. In PHP, use the MongoDB\Driver\Manager class to establish the connection. If the connection is not closed, it will remain open, which will occupy the server's resources and cause server performance to degrade.

2. How to close the connection?

In PHP 5.x version, you can use the following code to close the MongoDB connection:

$mongo = new MongoClient();
$mongo->close();

But in PHP 7 version, the MongoDB extension has been rewritten from the bottom up, and used new drivers. The new driver uses the MongoDB\Driver\Manager class to establish connections. Therefore, if you use the above code to close the connection, an error will be reported.

In PHP 7, the following code should be used to close the connection:

$mongo = new MongoDB\Driver\Manager("mongodb://localhost:27017");
unset($mongo);

In the above code, I first create an instance object $mongo of the MongoDB\Driver\Manager class, and then use unset( ) function destroys it. This will completely close the MongoDB connection and release server resources.

3. Notes on closing the connection

When using PHP to connect to MongoDB, you need to pay attention to the following points:

• It is recommended to access MongoDB every time The connection must be closed after the database is opened to reduce the pressure on the server.
• Do not use the MongoDB\Driver\Manager::getConnections() method to get the connection list, as this will cause the code to not work.
• You will not be able to access the MongoDB database after closing the connection. If you need to access again, please re-establish the connection.

4. Summary

Close the MongoDB connection is a good habit, which can reduce the burden on the server and improve server performance. In PHP 7, the unset() function should be used to destroy the instance object of the MongoDB\Driver\Manager class and close the MongoDB connection. At the same time, we need to be careful not to access the MongoDB database again after closing the connection.

The above is my introduction to how to close the MongoDB connection in PHP 7. I hope it will be helpful to you.

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