What are the potential drawbacks of appending multiple user IDs to a SQL insert statement in PHP?

Appending multiple user IDs to a SQL insert statement in PHP can lead to SQL injection vulnerabilities if the user input is not properly sanitized. To prevent this, it is recommended to use prepared statements with bound parameters to securely insert multiple user IDs into the database. 

// Sample code using prepared statements to insert multiple user IDs into the database securely

// Assume $user_ids is an array of user IDs
$user_ids = [1, 2, 3];

// Establish a database connection
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

// Prepare the SQL statement with placeholders
$stmt = $pdo->prepare("INSERT INTO users (user_id) VALUES (:user_id)");

// Bind the user ID parameter and execute the statement for each user ID
foreach ($user_ids as $user_id) {
    $stmt->bindParam(':user_id', $user_id);
    $stmt->execute();
}

Keywords

PHP SQL insert statement user IDs drawbacks

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