What are the limitations of using PHP to determine the display size provided by the browser?

PHP is a server-side language and does not have direct access to client-side information such as browser display size. To determine the display size provided by the browser, you would typically need to use JavaScript on the client side. One way to work around this limitation is to use JavaScript to get the display size and then pass that information to PHP using AJAX. 

// PHP code to handle AJAX request for browser display size
if(isset($_POST['width']) && isset($_POST['height'])){
    $width = $_POST['width'];
    $height = $_POST['height'];
    
    // Use the display size provided by the browser
    // for further processing
}
```

In your HTML file, you can use JavaScript to get the display size and send it to the PHP script using AJAX:

```javascript
// JavaScript code to get browser display size and send it to PHP script
var width = window.innerWidth;
var height = window.innerHeight;

var xhr = new XMLHttpRequest();
xhr.open('POST', 'get_display_size.php');
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xhr.send('width=' + width + '&height=' + height);

Keywords

PHP browser display size limitations detection

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