Passing variables from javascript to php

One of the frequent problems is defining visitor’s screen resolution using JavaScript tools and passing this data to PHP-script. The script below will find the resolution of the user screen using php and pass the value to the javascript location.href part from which it is redirected to a php page.

<script language="javascript" 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>

In this the variables ie the width and height is passed to a php page [MAIN.php]

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