What is the purpose of using an iframe in PHP scripts and what potential issues can arise from it?

Using an iframe in PHP scripts can be useful for embedding external content into a webpage. However, it can also introduce security risks such as clickjacking, where a malicious website can overlay an iframe with deceptive content to trick users into clicking on it. To prevent this, it is important to set the X-Frame-Options header to deny or sameorigin in the PHP script to prevent the page from being embedded in an iframe on another domain.

header('X-Frame-Options: DENY');