What potential issues can arise when handling form submissions in PHP, particularly with regards to user input?

One potential issue when handling form submissions in PHP is the possibility of SQL injection attacks if user input is not properly sanitized. To prevent this, always use prepared statements with parameterized queries when interacting with a database. 

// Example code snippet using prepared statements to prevent SQL injection
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->execute(['username' => $_POST['username']]);
$user = $stmt->fetch();

Keywords

SQL injection cross-site scripting form validation data sanitization error handling

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