How does the execution of PHP code in relation to frames impact the functionality of a website?

When PHP code is executed within frames on a website, it can sometimes lead to issues with variable scope and functionality. To ensure that PHP code functions correctly within frames, it is important to use the `target="_top"` attribute in form submissions and links to ensure that the PHP code is executed in the top-level frame.

<form action="your_php_script.php" method="post" target="_top">
  <!-- Form elements here -->
</form>