How to use transactions in MongoDB using PHP?

@lizzie 

To use transactions in MongoDB using PHP, you need to follow these steps:

1. Check MongoDB version: Make sure that your MongoDB version is 4.0 or higher because transactions are not supported in previous versions of MongoDB.
2. Create a MongoClient instance: You need to create a MongoClient instance for connecting to the MongoDB server.
3. Choose a database: Select a database for performing transactions on.
4. Start a session: Start a session in MongoDB, which is required when using transactions.
5. Start a transaction: Begin a transaction using the startTransaction() method.
6. Perform operations: Perform the necessary read and write operations within the transaction.
7. Commit or abort transaction: Use the commitTransaction() method to commit the transaction or the abortTransaction() method to abort it.

Here's an example code to perform a transaction in MongoDB using PHP:

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<?php
try {

    // Connect to MongoDB
    $uri = "mongodb://localhost:27017";
    $client = new MongoDBClient($uri);

    // Select a database
    $database = $client->myDatabase;

    // Start a session
    $session = $client->startSession();

    // Start a transaction
    $session->startTransaction();

    // Perform read and write operations within transaction
    $collection = $database->myCollection;
    $result = $collection->insertOne([
        'name' => 'John Doe'
    ]);

    // Commit transaction
    $session->commitTransaction();

} catch(Exception $e) {

    // Abort transaction
    $session->abortTransaction();

}
?>

In this example, we connect to MongoDB, select a database, start a session, and begin a transaction. We then perform an insert operation and commit the transaction. If there are any errors, the transaction is aborted.