I know there are several ways to get the screen size by javascript, etc. but I have not found a satisfactory way to get this size to PHP BEFORE loading the screen.
For example, I would like the HTML / PHP file below to get the width of the screen somehow in the% PHP $largura_tela variable:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<?php echo $largura_tela; ?>
</body>
</html>
Look, I do not understand why you want this information in PHP, but here's an example of how it could be done ...
Create a file called detectScreen.php and add it to your home page:
<?php
@session_start();
if(isset($_GET['heigthJanela'])) {
$_SESSION['screenInfo'] = [
'heigthJanela' => $_GET['heigthJanela'],
'widthJanela' => $_GET['widthJanela'],
'heightTela' => $_GET['heightTela'],
'widthTela' => $_GET['widthTela']
];
echo '<script>
window.history.go(-1);
</script>';
die;
} else {
if(!isset($_SESSION['screenInfo'])) {
echo '<script>
window.location.href = "detectScreen.php?heigthJanela="+window.innerHeight+"&widthJanela="+window.innerWidth+"&heightTela="+screen.height+"&widthTela="+screen.width;
</script>';
die;
}
}