How can SQL injection vulnerabilities be prevented when querying and inserting data in PHP?

SQL injection vulnerabilities can be prevented by using prepared statements with parameterized queries in PHP. This technique ensures that user input is treated as data rather than executable code, thus preventing malicious SQL injection attacks. 

// 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 parameter value to the query
$stmt->bindParam(':username', $_POST['username']);

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

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

Keywords

SQL injection PHP prepared statements PDO parameterized queries

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