[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.phphttp://72.249.146.214/abc.phphttp://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:


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技术大类 » PHP/JS/Shell | 评论(42) | 引用(1) | 阅读(56238)
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