How can PHP developers ensure that their scripts are secure and protected against vulnerabilities?

To ensure that PHP scripts are secure and protected against vulnerabilities, developers should implement input validation, sanitize user input, use prepared statements for database queries to prevent SQL injection, and avoid using deprecated functions or insecure coding practices. 

// Example of input validation and sanitization
$user_input = $_POST['user_input'];
$clean_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Example of using prepared statements for database queries
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $username);
$stmt->execute();

Keywords

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

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