What potential pitfalls can arise when using PHP to handle form submissions?

One potential pitfall when using PHP to handle form submissions is not properly sanitizing user input, leaving the application vulnerable to SQL injection attacks. To solve this issue, always use prepared statements when interacting with a database to prevent malicious input from being executed as SQL commands. 

// Establish database connection
$mysqli = new mysqli("localhost", "username", "password", "database");

// Prepare SQL statement with placeholders
$stmt = $mysqli->prepare("INSERT INTO users (username, email) VALUES (?, ?)");

// Bind parameters to placeholders
$stmt->bind_param("ss", $_POST['username'], $_POST['email']);

// Execute the statement
$stmt->execute();

// Close the statement and database connection
$stmt->close();
$mysqli->close();

Keywords

SQL injection cross-site scripting form validation CSRF attacks file uploads

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