web的测试与正式环境切换

做了个正式网站 与测试网站的切换功能，大家看看帅不帅?

<?php
     
     
    if(!empty($_REQUEST['act']))
    {
        $act = empty($_REQUEST['act']) ? die('你在开玩笑吗？') : $_REQUEST['act'] ;
        $hosts = new UpdateHosts();
        if ($act == 'test') {
            $hosts->add_test_server_ip();
        }else if($act == 'official'){
            $hosts->del_test_server_ip();
        }else
        {
            $hosts->del_test_server_ip();
        }
    }
 
class UpdateHosts
{
    //*正式服务器与测试服务器的ip进行切换*//
    /*思路
     检查windows的hosts文件，如果存在测试的ip字符串，就替换为空。不存在就添加上去。
    */
    //测试机ip头
     
    var $win7   = "C:\Windows\System32\drivers\etc\hosts";
    var $winxp = "C:\Windows\System32\drivers\etc\hosts";
    var $test_server_ip = "192.16.15.21 www.xxx.com\r\n192.16.15.21 m.xxx.com\r\n192.16.15.21   xxx.com";
    var $filename = "";
    var $file_data = "";
    function __construct(){
         
        if(get_os() == 'Windows 7')
        {
            $this->filename = $this->win7;
        }else {
            echo '抱歉目前您使用的操作系统，现在还不能进行切换，请联系程序员为您开发。';
            die();
        }
         
        //如果存在这个文件
        if(is_file($this->filename))
        {
            $this->file_data = file_get_contents($this->filename);
            //var_dump($this->file_data);
            echo "*****************************************<br>";
        }
        else
        {
            echo "抱歉找不到该文件";
        }
    }
     
    public  function del_test_server_ip()
    {
        //去掉测试ip头
        if (strstr($this->file_data,$this->test_server_ip) ) {
            $file_content = str_replace("\r\n".$this->test_server_ip, "", $this->file_data);
            $fp = fopen($this->filename ,"w");
            flock($fp, LOCK_EX) ;
            fwrite($fp,$file_content);
            flock($fp, LOCK_UN);
            fclose($fp);
            echo "当前是正式服务器环境";
        }else {
            echo "当前是正式服务器环境";
        }      
    }
     
    public function add_test_server_ip()
    {
        //添加测试ip头
        if (strstr($this->file_data,$this->test_server_ip)) {
            echo "当前是测试服务器环境";
        }else {
            //添加到hosts文件末尾
            $fp = fopen($this->filename ,"a");
            flock($fp, LOCK_EX) ;
            fwrite($fp,"\r\n".$this->test_server_ip);
            flock($fp, LOCK_UN);
            fclose($fp);
            echo "当前是测试服务器环境";
        }
    }
}
 
/**
 * 获取客户端操作系统信息
 * @param null
 * @return string
 */
function get_os()
{
    $agent = $_SERVER['HTTP_USER_AGENT'];
    $os = false;
 
    if (preg_match('/win/i', $agent) &amp;&amp; strpos($agent, '95'))
    {
        $os = 'Windows 95';
    }
    else if (preg_match('/win 9x/i', $agent) &amp;&amp; strpos($agent, '4.90'))
    {
        $os = 'Windows ME';
    }
    else if (preg_match('/win/i', $agent) &amp;&amp; preg_match('/98/i', $agent))
    {
        $os = 'Windows 98';
    }
    else if (preg_match('/win/i', $agent) &amp;&amp; preg_match('/nt 6.0/i', $agent))
    {
        $os = 'Windows Vista';
    }
    else if (preg_match('/win/i', $agent) &amp;&amp; preg_match('/nt 6.1/i', $agent))
    {
        $os = 'Windows 7';
    }
    else if (preg_match('/win/i', $agent) &amp;&amp; preg_match('/nt 6.2/i', $agent))
    {
        $os = 'Windows 8';
    }
    else if (preg_match('/win/i', $agent) &amp;&amp; preg_match('/nt 5.1/i', $agent))
    {
        $os = 'Windows XP';
    }
    else if (preg_match('/win/i', $agent) &amp;&amp; preg_match('/nt 5/i', $agent))
    {
        $os = 'Windows 2000';
    }
    else if (preg_match('/win/i', $agent) &amp;&amp; preg_match('/nt/i', $agent))
    {
        $os = 'Windows NT';
    }
    else if (preg_match('/win/i', $agent) &amp;&amp; preg_match('/32/i', $agent))
    {
        $os = 'Windows 32';
    }
    else if (preg_match('/linux/i', $agent))
    {
        $os = 'Linux';
    }
    else if (preg_match('/unix/i', $agent))
    {
        $os = 'Unix';
    }
    else if (preg_match('/sun/i', $agent) &amp;&amp; preg_match('/os/i', $agent))
    {
        $os = 'SunOS';
    }
    else if (preg_match('/ibm/i', $agent) &amp;&amp; preg_match('/os/i', $agent))
    {
        $os = 'IBM OS/2';
    }
    else if (preg_match('/Mac/i', $agent) &amp;&amp; preg_match('/PC/i', $agent))
    {
        $os = 'Macintosh';
    }
    else if (preg_match('/PowerPC/i', $agent))
    {
        $os = 'PowerPC';
    }
    else if (preg_match('/AIX/i', $agent))
    {
        $os = 'AIX';
    }
    else if (preg_match('/HPUX/i', $agent))
    {
        $os = 'HPUX';
    }
    else if (preg_match('/NetBSD/i', $agent))
    {
        $os = 'NetBSD';
    }
    else if (preg_match('/BSD/i', $agent))
    {
        $os = 'BSD';
    }
    else if (preg_match('/OSF1/i', $agent))
    {
        $os = 'OSF1';
    }
    else if (preg_match('/IRIX/i', $agent))
    {
        $os = 'IRIX';
    }
    else if (preg_match('/FreeBSD/i', $agent))
    {
        $os = 'FreeBSD';
    }
    else if (preg_match('/teleport/i', $agent))
    {
        $os = 'teleport';
    }
    else if (preg_match('/flashget/i', $agent))
    {
        $os = 'flashget';
    }
    else if (preg_match('/webzip/i', $agent))
    {
        $os = 'webzip';
    }
    else if (preg_match('/offline/i', $agent))
    {
        $os = 'offline';
    }
    else
    {
        $os = '未知操作系统';
    }
    return $os;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>测试与正式环境切换</title>
</head>
 
<body>
<p>切换到 -> <a href="?act=test"> 测试环境</a></p>
<p>切换到 -> <a href="?act=official"> 正式环境</a></p>
</body>
</html>