What are best practices for handling user input in PHP forms to prevent SQL injection and other security vulnerabilities?

To prevent SQL injection and other security vulnerabilities in PHP forms, it is essential to sanitize and validate user input before using it in database queries. This can be done by using prepared statements with parameterized queries, filtering input data to remove potentially harmful characters, and validating input against expected formats. 

// 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 security vulnerabilities user input validation prepared statements htmlspecialchars

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