$username = "admin'; DROP TABLE users"; $password = "password"; $sql = "SELECT * FROM users WHERE username='" . db_esc($username) . "' AND password='" . db_esc($password) . "'";
$pdo = new PDO('mysql:host=localhost;dbname=mydb', 'username', 'password'); $stmt = $pdo->prepare("INSERT INTO users (username, password) VALUES (:username, :password)"); $stmt->bindParam(':username', db_esc($_POST['username'])); $stmt->bindParam(':password', db_esc($_POST['password'])); $stmt->execute();In this example, the PDO package library is used to insert a new user into the database. The db_esc function is used to escape any special characters in the user input before it is inserted into the database, preventing SQL injection attacks. Overall, the PHP db esc library is a crucial component in securing PHP applications that use databases, and it is typically included in package libraries such as mysqli or PDO.