How can HTML errors impact PHP functionality, and what are best practices for ensuring proper HTML syntax in PHP scripts?

HTML errors can impact PHP functionality by causing issues with rendering the output of PHP scripts correctly. To ensure proper HTML syntax in PHP scripts, it is essential to validate the HTML code and fix any errors before integrating it with PHP. One way to ensure proper HTML syntax is to use an HTML validator tool to check for errors and make necessary corrections.

<?php
// Example PHP script with proper HTML syntax

$html = '<div><p>Hello, world!</p></div>';

// Output the HTML
echo $html;
?>