How to secure PHP web applications and prevent attacks?

1) Cross site scripting (XSS) XSS attacks happen when client-side code (usually JavaScript) gets injected into the output of your PHP script. This can be through the URL, but can also occur via a stored technique such as the database. // GET data is sent through URL: http://example.com/search.php?search=<script>alert(‘test’)</script> $search = $_GET[‘search’] ?? null; echo ‘Search

What is Transaction and how to implement transaction in php using mysqli ?

A transaction is a sequential group of database manipulation operations, which is performed in a sequential manner. In other words, a transaction will never be complete unless each individual operation within the group is successful. If any step or process within the transaction fails, the entire transaction will fail. Properties of Transactions Atomicity − All operations