What potential issue does the current PHP script have with recording high scores for a game?

The current PHP script may have an issue with recording high scores for a game if it does not properly handle concurrent requests. This can lead to race conditions where multiple requests try to update the high score at the same time, potentially causing data corruption or incorrect scores. To solve this issue, you can use database transactions to ensure that only one request can update the high score at a time. 

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

// Retrieve the current high score
$stmt = $pdo->prepare("SELECT score FROM high_scores FOR UPDATE");
$stmt->execute();
$currentScore = $stmt->fetchColumn();

// Update the high score if the new score is higher
if ($newScore > $currentScore) {
    $stmt = $pdo->prepare("UPDATE high_scores SET score = :newScore");
    $stmt->bindValue(':newScore', $newScore);
    $stmt->execute();
}

// Commit the transaction
$pdo->commit();

Keywords

SQL injection XSS vulnerability session handling database connection data validation

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