What strategies can be implemented in PHP to prevent duplicate purchases by users and maintain accurate records of transactions?

To prevent duplicate purchases by users and maintain accurate transaction records in PHP, one strategy is to generate a unique transaction ID for each purchase and store it in a database. Before processing a new purchase, check if the transaction ID already exists in the database to avoid duplicates. 

// Generate a unique transaction ID
$transaction_id = uniqid();

// Check if the transaction ID already exists in the database
$query = "SELECT * FROM transactions WHERE transaction_id = '$transaction_id'";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0){
    // Duplicate transaction ID found, generate a new one
    $transaction_id = uniqid();
}

// Insert the transaction record into the database
$query = "INSERT INTO transactions (transaction_id, user_id, amount) VALUES ('$transaction_id', '$user_id', '$amount')";
mysqli_query($connection, $query);

Keywords

Data validation Unique constraints Session management Database transactions Error handling

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