What potential issues can arise when using PHP to dynamically update content on a webpage?

One potential issue that can arise when using PHP to dynamically update content on a webpage is the risk of SQL injection attacks if user input is not properly sanitized. To prevent this, always use prepared statements or parameterized queries when interacting with a database in PHP. 

// Example of using prepared statements to prevent SQL injection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $_POST['username']);
$stmt->execute();
$result = $stmt->fetch();

Keywords

SQL injection cross-site scripting server-side validation session hijacking data sanitization

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