Passare variabili Javascript a PHP

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Javascript: 

<script type="text/javascript">

width = screen.width;
height = screen.height;

if (width > 0 && height >0) {
    window.location.href = "http://localhost/main.php?width=" + width + "&height=" + height;
} else 
    exit();

</script>

PHP: 

<?php
echo "<h1>Screen Resolution:</h1>";
echo "Width  : " . $_GET['width'] . "<br>";
echo "Height : " . $_GET['height'] . "<br>";
?>

Riferimenti

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