What are some best practices for handling input data in PHP to prevent security vulnerabilities?

To prevent security vulnerabilities when handling input data in PHP, it is important to sanitize and validate user input to prevent SQL injection, cross-site scripting (XSS), and other attacks. One best practice is to use prepared statements with parameterized queries to securely interact with databases. Additionally, always validate and sanitize user input before processing or displaying it to ensure data integrity and security. 

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $_POST['username']);
$stmt->execute();
$result = $stmt->fetch();

Keywords

SQL injection Cross-site scripting (XSS) Data validation Sanitization Escaping

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