How can PHP developers ensure that their scripts are not vulnerable to SQL injection attacks?

To prevent SQL injection attacks in PHP scripts, developers should use prepared statements with parameterized queries instead of directly inserting user input into SQL queries. This helps to separate SQL logic from user input, making it harder for attackers to inject malicious code into the database. 

// Establish a database connection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a SQL statement with a parameterized query
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind the user input to the query parameters
$stmt->bindParam(':username', $_POST['username']);

// Execute the prepared statement
$stmt->execute();

// Fetch the results
$results = $stmt->fetchAll();

Keywords

SQL injection prepared statements PDO mysqli_real_escape_string parameterized queries

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