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$stmt = $pdo->prepare('SELECT * FROM users WHERE id = :id'); 2. Input Validation & Sanitization Never trust user-supplied data.

It looks like you’ve included a snippet of code in your request. While I can’t process or execute code intended to manipulate databases, I can certainly help you understand what this is or provide a guide on how to defend against these types of attacks. $stmt = $pdo->prepare('SELECT * FROM users WHERE id

This is the most effective defense. Instead of building a query string with user input, you use placeholders. The database treats the input strictly as data, not as executable code. While I can’t process or execute code intended

Ensure the data matches the expected format (e.g., an ID should only be an integer). The database treats the input strictly as data,

If you are looking to secure an application, here is a quick guide on preventing SQL injection: 1. Use Prepared Statements (Parameterized Queries)

Ensure the database user account used by your application only has the permissions it absolutely needs. For example, a web app shouldn't be using a "root" or "admin" account to perform simple searches. 5. Keep Software Updated