同一域名对应多个IP时，PHP获取远程网页内容的函数[原创]

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2008-12-15 00:01 | by 张宴 ]

　　[文章作者：张宴本文版本：v1.0 最后修改：2008.12.15 转载请注明原文链接：http://blog.zyan.cc/post/389/]

　　PHP获取远程网页内容有多种方式，例如用自带的file_get_contents、fopen等函数。

引用

<?php
echo file_get_contents("http://blog.zyan.cc/abc.php");
?>

　　但是，在DNS轮询等负载均衡中，同一域名，可能对应多台服务器，多个IP。假设blog.zyan.cc被DNS解析到72.249.146.213、72.249.146.214、72.249.146.215三个IP，用户每次访问blog.zyan.cc，系统会根据负载均衡的相应算法访问其中的一台服务器。

　　上周做一个视频项目时，就碰到这样一类需求：需要依次访问每台服务器上的一个PHP接口程序（假设为abc.php），查询这台服务器的传输状态。

　　这时就不能直接用file_get_contents访问http://blog.zyan.cc/abc.php了，因为它可能一直重复访问某一台服务器。

　　而采用依次访问http://72.249.146.213/abc.php、http://72.249.146.214/abc.php、http://72.249.146.215/abc.php的方法，在这三台服务器上的Web Server配有多个虚拟主机时，也是不行的。

　　通过设置本地hosts也不行，因为hosts不能设置多个IP对应同一个域名。

　　那就只有通过PHP和HTTP协议来实现：访问abc.php时，在header头中加上blog.zyan.cc域名。于是，我写了下面这个PHP函数：

<?php
/************************
* 函数用途：同一域名对应多个IP时，获取指定服务器的远程网页内容
* 创建时间：2008-12-09
* 创建人：张宴（blog.zyan.cc）
* 参数说明：
*    $ip   服务器的IP地址
*    $host   服务器的host名称
*    $url   服务器的URL地址（不含域名）
* 返回值：
*    获取到的远程网页内容
*    false   访问远程网页失败
************************/
function HttpVisit($ip, $host, $url)   
{   
    $errstr = '';   
    $errno = '';
    $fp = fsockopen ($ip, 80, $errno, $errstr, 90);
    if (!$fp)   
    {   
         return false;   
    }   
    else  
    {   
        $out = "GET {$url} HTTP/1.1\r\n";
        $out .= "Host:{$host}\r\n";   
        $out .= "Connection: close\r\n\r\n";
        fputs ($fp, $out);

while($line = fread($fp, 4096)){
           $response .= $line;
        }
        fclose( $fp );

//去掉Header头信息
        $pos = strpos($response, "\r\n\r\n");
        $response = substr($response, $pos + 4);
    
        return $response;   
    }   
}

//调用方法：
$server_info1 = HttpVisit("72.249.146.213", "blog.zyan.cc", "/abc.php");
$server_info2 = HttpVisit("72.249.146.214", "blog.zyan.cc", "/abc.php");
$server_info3 = HttpVisit("72.249.146.215", "blog.zyan.cc", "/abc.php");
?>

Tags: php

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