How can SQL injection vulnerabilities be prevented when incorporating user input into SQL queries in PHP?

SQL injection vulnerabilities can be prevented by using prepared statements and parameterized queries in PHP. This technique separates the SQL query logic from the user input, preventing malicious SQL commands from being injected into the query. 

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

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

Keywords

SQL injection PHP prepared statements parameterized queries input validation

Related Questions