What common mistake is the user making in the PHP registration script provided in the forum thread?

The common mistake in the PHP registration script is that the user is not sanitizing the user input before inserting it into the database, leaving it vulnerable to SQL injection attacks. To solve this issue, the user should use prepared statements with parameterized queries to safely insert user input into the database. 

// Fix for sanitizing user input in PHP registration script
// Use prepared statements with parameterized queries to prevent SQL injection

// Assuming $conn is the database connection

$username = $_POST['username'];
$password = $_POST['password'];

$stmt = $conn->prepare("INSERT INTO users (username, password) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $password);

$stmt->execute();

$stmt->close();
$conn->close();

Keywords

PHP registration script forum thread mistake error types

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