php订单物流盯梢呈现网络反常怎样处理

<?php
echo web-root = .$_SERVERdocument_ROOT.<br>;
echo current-file = .__FILE__.<br>;
echo current-dir = .dirname(__FILE__).<br>;

echo http-root = .$_SERVERHTTP_HOST.<br>;
echo web-position = .$_SERVERPHP_SELF.<br>;

$file=c:/webroot/index.php;
echo file-position = .$file.<br>;

$fileWebAddress=http://.str_replace($_SERVERdocument_ROOT,$_SERVERHTTP_HOST,$file);
echo file-web-position = .$fileWebAddress.<br>;

?>