What happens when multiple users simultaneously make an entry in a database using PHP?

When multiple users simultaneously make an entry in a database using PHP, there is a risk of data inconsistency or conflicts. To solve this issue, you can implement database transactions to ensure that the database operations are atomic and consistent. By using transactions, you can guarantee that either all the database operations within a transaction are completed successfully or none of them are. 

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

try {
    // Perform database operations here

    // Commit the transaction if all operations are successful
    $db->commit();
} catch (Exception $e) {
    // Roll back the transaction if any operation fails
    $db->rollBack();
    echo "Transaction failed: " . $e->getMessage();
}

Keywords

concurrency race condition database locking transactions PHP mysqli.

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