What are the best practices for handling user input and form submissions in PHP to prevent malicious code injection?

To prevent malicious code injection in PHP when handling user input and form submissions, it is essential to sanitize and validate the input data before using it in your application. This can be done by using functions like `htmlspecialchars()` to escape special characters and `filter_input()` to validate input data. Additionally, using prepared statements with parameterized queries when interacting with a database can help prevent SQL injection attacks. 

// Sanitize and validate user input
$name = htmlspecialchars($_POST['name']);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);

// Use prepared statements to prevent SQL injection
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

Keywords

SQL injection Cross-site scripting (XSS) htmlspecialchars filter_input prepared statements

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