What are the limitations of PHP in terms of client-side interactions like reading keyboard inputs?

PHP is a server-side language and does not have direct access to client-side interactions like reading keyboard inputs. To achieve this functionality, you would need to use a combination of JavaScript and PHP. JavaScript can capture keyboard inputs on the client-side and send them to the server using AJAX requests. The server-side PHP script can then process the input and send back a response to the client. 

// index.html
<!DOCTYPE html>
<html>
<head>
    <title>Keyboard Input Example</title>
</head>
<body>
    <input type="text" id="input">
    <button onclick="sendInput()">Submit</button>
    
    <script>
        function sendInput() {
            var input = document.getElementById('input').value;
            var xhr = new XMLHttpRequest();
            xhr.open('POST', 'process_input.php', true);
            xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
            xhr.send('input=' + input);
        }
    </script>
</body>
</html>
```

```php
// process_input.php
<?php
$input = $_POST['input'];
// Process the input here
echo 'Input received: ' . $input;
?>

Keywords

PHP client-side interactions limitations reading keyboard inputs security.

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