What are the potential pitfalls of attempting to execute PHP code within JavaScript functions?

Attempting to execute PHP code within JavaScript functions can lead to security vulnerabilities such as Cross-Site Scripting (XSS) attacks. To avoid this, it is recommended to separate the PHP logic from the JavaScript code by using AJAX to make server-side requests for data. 

// PHP code to handle AJAX request
<?php
if(isset($_POST['data'])){
  $data = $_POST['data'];
  // Perform necessary PHP logic here
  echo json_encode($result);
}
?>
```

```javascript
// JavaScript code to make AJAX request
function fetchData() {
  var data = 'example_data';
  $.ajax({
    type: 'POST',
    url: 'ajax_handler.php',
    data: { data: data },
    success: function(response) {
      // Handle the response from the server
    }
  });
}

Keywords

PHP JavaScript code execution security vulnerabilities cross-site scripting

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