How can SQL injection vulnerabilities be prevented when using PHP for database operations?

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

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

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

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

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

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

Keywords

SQL injection PHP prepared statements parameterized queries input validation

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