php取得客户窗口的分辩率

源代码网整理以下　　<?php
if(!$_GET["screenX"]) {
echo '
<script>
location = location.href+"?screenX="+screen.width+"&screenY="+screen.height;
</script>
';
exit;
}
$screenX = $_GET["screenX"];
$screenY = $_GET["screenY"];
?>

源代码网整理以下　　以下是其他内容