What security measures should be implemented when handling user inputs in PHP, especially in relation to form submissions?

When handling user inputs in PHP, especially in relation to form submissions, it is important to implement security measures to prevent common vulnerabilities such as SQL injection and cross-site scripting (XSS). One way to enhance security is to sanitize and validate user inputs before processing them. This can be achieved by using functions like htmlspecialchars() to prevent XSS attacks and prepared statements to prevent SQL injection attacks. 

// Sanitize and validate user input from a form submission
$name = htmlspecialchars($_POST['name']);
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

// Use prepared statements to prevent SQL injection
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

Keywords

SQL injection Cross-site scripting (XSS) Form validation Sanitization Input filtering

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