How can PHP developers improve the security of their code when dealing with user input and database interactions?

To improve the security of PHP code when dealing with user input and database interactions, developers should utilize prepared statements to prevent SQL injection attacks and validate and sanitize user input to prevent cross-site scripting (XSS) attacks. 

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $username);
$stmt->execute();
```

```php
// Example of validating and sanitizing user input to prevent XSS attacks
$username = htmlspecialchars($_POST['username']);
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

Keywords

SQL injection input validation prepared statements password hashing cross-site scripting

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