What recommendations can be provided for handling situations where data may change before updates are completed in PHP applications interacting with external systems?

When dealing with situations where data may change before updates are completed in PHP applications interacting with external systems, it is important to implement a locking mechanism to ensure data consistency. One way to achieve this is by using database transactions to lock the data during the update process, preventing any other processes from modifying it until the update is completed. 

// Start a transaction to lock the data
$db->beginTransaction();

try {
    // Perform the update operation
    $stmt = $db->prepare("UPDATE table SET column = :value WHERE id = :id");
    $stmt->execute(['value' => $newValue, 'id' => $id]);

    // Commit the transaction to release the lock
    $db->commit();
} catch (Exception $e) {
    // Rollback the transaction in case of an error
    $db->rollBack();
    echo "Error updating data: " . $e->getMessage();
}

Keywords

concurrency race condition locking transactions error handling

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