What are the limitations of using PHP code directly in an onclick event?

When using PHP code directly in an onclick event, the code will not be executed as PHP is a server-side language and onclick events are client-side. To overcome this limitation, you can use AJAX to send a request to the server and execute the PHP code. 

// PHP code to be executed
<?php
  // Your PHP code here
?>

// HTML button with onclick event calling a JavaScript function
<button onclick="sendRequest()">Click me</button>

// JavaScript function to send an AJAX request
<script>
  function sendRequest() {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', 'your_php_script.php', true);
    xhr.send();
  }
</script>

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