Are there any recommended resources or eBooks for learning about PHP security vulnerabilities and how to mitigate them?

One recommended eBook for learning about PHP security vulnerabilities and how to mitigate them is "Essential PHP Security" by Chris Shiflett. This book covers common PHP security issues such as SQL injection, cross-site scripting, and session hijacking, and provides practical solutions for securing PHP applications.

// Example of mitigating SQL injection vulnerability using prepared statements

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

// Prepare SQL statement
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind parameters
$stmt->bindParam(':username', $_POST['username']);

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

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