$serverAddress

 <?php
 // 输出服务器的本机地址
-$serverAddress = $_SERVER['HTTP_HOST'];
-echo "服务器的本机地址是：{$serverAddress}<br>";
+//$serverAddress = $_SERVER['HTTP_HOST'];
+//echo "服务器的本机地址是：{$serverAddress}<br>";
 
 // 输出客户端的本机地址
 $clientAddress = $_SERVER['REMOTE_ADDR'];