Where can I find reliable resources and documentation on PHP security best practices for form handling?

When handling forms in PHP, it is crucial to follow security best practices to prevent common vulnerabilities such as SQL injection, cross-site scripting (XSS), and CSRF attacks. To ensure the security of your form handling code, you should sanitize and validate user input, use prepared statements for database queries, and implement CSRF tokens to prevent cross-site request forgery. 

```php
<?php
// Sanitize and validate user input
$name = filter_var($_POST['name'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

// Use prepared statements for database queries
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

// Implement CSRF tokens
session_start();
$token = bin2hex(random_bytes(32));
$_SESSION['csrf_token'] = $token;

// In the form HTML
<input type="hidden" name="csrf_token" value="<?php echo $token; ?>">
```
(Note: This code snippet assumes you have an active PDO connection to a database and a form submission handling script.)

Keywords

PHP security form handling documentation resources best practices

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