What potential pitfalls can arise when using PHP to handle form submissions and MySQL database entries?

One potential pitfall is SQL injection attacks, where malicious users input SQL commands into form fields to manipulate the database. To prevent this, always sanitize and validate user input before using it in SQL queries. 

// Sanitize and validate user input before using it in SQL queries
$username = mysqli_real_escape_string($connection, $_POST['username']);
$password = mysqli_real_escape_string($connection, $_POST['password']);

// Perform SQL query with sanitized input
$query = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
mysqli_query($connection, $query);

Keywords

SQL injection data validation prepared statements XSS attacks error handling

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