How can developers protect against SQL injection attacks in PHP applications?

SQL injection attacks can be prevented in PHP applications by using prepared statements with parameterized queries. This method separates the SQL query logic from the user input, preventing malicious input from being executed as SQL commands. 

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

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

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

// Execute the query
$stmt->execute();

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

Keywords

SQL injection PHP applications prepared statements parameterized queries input validation

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