How can PHP beginners avoid potential security risks in their code?

PHP beginners can avoid potential security risks in their code by implementing input validation, using prepared statements for database queries to prevent SQL injection attacks, escaping output to prevent cross-site scripting (XSS) attacks, and keeping software and libraries up to date to patch any known security vulnerabilities. 

// Example of input validation to prevent SQL injection
$user_input = $_POST['user_input'];
$filtered_input = filter_var($user_input, FILTER_SANITIZE_STRING);

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

// Example of escaping output to prevent XSS attacks
echo htmlspecialchars($user_input, ENT_QUOTES, 'UTF-8');

Keywords

SQL injection cross-site scripting input validation secure coding practices password hashing

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