What best practices should be followed when handling form submissions in PHP to ensure data security and integrity?

When handling form submissions in PHP, it is crucial to validate and sanitize user input to prevent SQL injection and other security vulnerabilities. Additionally, using prepared statements with parameterized queries can help protect against malicious attacks. It is also recommended to implement CSRF tokens to prevent cross-site request forgery. 

// Validate and sanitize user input
$name = filter_var($_POST['name'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

// Prepare and execute a parameterized query
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

// Implement CSRF token validation
session_start();
if ($_POST['csrf_token'] !== $_SESSION['csrf_token']) {
    die("CSRF token validation failed");
}

Keywords

SQL injection CSRF protection input validation prepared statements data sanitization

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