What are some best practices for ensuring cross-browser compatibility in PHP web development?

Ensuring cross-browser compatibility in PHP web development involves writing code that works consistently across different web browsers. One best practice is to use CSS resets to ensure a consistent starting point for styling across browsers. Another practice is to test the website on multiple browsers and devices to identify and fix any compatibility issues. Additionally, using feature detection rather than browser detection can help ensure that the website functions properly regardless of the browser being used.

// Example of using CSS reset in PHP
echo "<style>";
echo "body, div, h1, h2, h3, p, ul, li { margin: 0; padding: 0; }";
echo "</style>";