How can developers prevent SQL injection and Cross-Site Scripting vulnerabilities in PHP forum scripts?

To prevent SQL injection in PHP forum scripts, developers should use prepared statements with parameterized queries instead of directly inserting user input into SQL queries. To prevent Cross-Site Scripting vulnerabilities, developers should sanitize user input before displaying it on the website. 

// SQL injection prevention
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $_POST['username']);
$stmt->execute();

// Cross-Site Scripting prevention
$username = htmlspecialchars($_POST['username'], ENT_QUOTES);
echo "Welcome, " . $username;

Keywords

SQL injection Cross-Site Scripting prepared statements mysqli_real_escape_string htmlspecialchars

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