How can PHP developers ensure proper variable handling and data sanitization to avoid security risks and improve code quality?

PHP developers can ensure proper variable handling and data sanitization by using functions like `filter_var()` to validate and sanitize user input, and by using prepared statements when interacting with databases to prevent SQL injection attacks. Additionally, developers should always use proper input validation and output encoding to prevent cross-site scripting (XSS) attacks. 

// Example of using filter_var() to sanitize input
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = ?");
$stmt->execute([$username]);

Keywords

PHP variable handling data sanitization security risks code quality

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