What are the potential pitfalls of using PHP variables in alert boxes on button click events?

Using PHP variables in alert boxes on button click events can be problematic because PHP is a server-side language and alert boxes are client-side. This means that the PHP variable will not be accessible when the alert box is triggered. To solve this issue, you can use JavaScript to pass the PHP variable to the client-side and then display it in the alert box. 

```php
<?php
$variable = "Hello, World!";
?>

<button onclick="showAlert('<?php echo $variable; ?>')">Click me</button>

<script>
function showAlert(message) {
  alert(message);
}
</script>

Keywords

PHP variables alert boxes button click events potential pitfalls data validation

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