What are common pitfalls when designing buttons in PHP?

Common pitfalls when designing buttons in PHP include not properly styling the buttons, not handling button click events correctly, and not validating user input before processing button actions. To solve these issues, make sure to apply CSS styles to buttons for a visually appealing design, use JavaScript to handle button click events for interactive functionality, and implement server-side validation to prevent any malicious input.

<button style="background-color: blue; color: white;">Click me</button>

<script>
document.querySelector('button').addEventListener('click', function() {
  // Handle button click event here
});
</script>

<?php
if(isset($_POST['submit'])) {
  // Validate user input before processing button action
}
?>