Is using PDO sufficient for securing PHP applications, or are additional security measures necessary?

Using PDO is a good step towards securing PHP applications by preventing SQL injection attacks through parameterized queries. However, additional security measures such as input validation, output encoding, and proper error handling are still necessary to ensure comprehensive security. 

// Example of using PDO and additional security measures
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Input validation
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$password = filter_input(INPUT_POST, 'password', FILTER_SANITIZE_STRING);

// Prepare and execute a parameterized query
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username AND password = :password');
$stmt->execute(array('username' => $username, 'password' => $password));

// Output encoding
foreach ($stmt as $row) {
    echo htmlspecialchars($row['username']);
}

Keywords

PDO PHP applications security measures additional securing

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