How can PHP developers protect against SQL injection vulnerabilities in their code?

To protect against SQL injection vulnerabilities in PHP code, developers should use prepared statements with parameterized queries instead of directly inserting user input into SQL queries. This helps to prevent malicious SQL code from being injected into the query and executed. 

// 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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