What are the best practices for implementing transactions in PHP to prevent race conditions in a multi-user environment?

Race conditions can occur in a multi-user environment when multiple users are trying to access and modify shared resources simultaneously. To prevent race conditions when implementing transactions in PHP, it is essential to use database transactions to ensure that all database operations are atomic and isolated. This can be achieved by starting a transaction, performing the necessary database operations, and then committing the transaction to ensure that all changes are made in a consistent manner. 

// Start a transaction
$pdo->beginTransaction();

try {
    // Perform database operations within the transaction
    $pdo->exec("UPDATE table SET column = value WHERE condition");

    // Commit the transaction
    $pdo->commit();
} catch (Exception $e) {
    // Rollback the transaction if an error occurs
    $pdo->rollBack();
    echo "Transaction failed: " . $e->getMessage();
}

Keywords

transactions PHP race conditions multi-user environment concurrency

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