_php tutorial for getting Remote Web page content from PHP with multiple IP domains

Fire Station College (bkjia.com) PHP tutorialPHP gets Remote Web page content in several ways, such as using its own file_get_contents, fopen and other functions.

Echo file_get_contents ("http://www.bkjia.com/abc.php"); ?>

However, in a load balancer such as DNS polling, the same domain name may correspond to multiple servers, more than one IP. Suppose blog.kcoffee.net is parsed by DNS to 72.249.146.213, 72.249.146.214, 72.249.146.215 three IPs, Each time a user accesses blog.kcoffee.net, one of the servers is accessed based on the appropriate algorithm for load balancing.

When I was doing a video project last week, I met a requirement that we should go to a PHP interface program on each server (assuming abc.php) and query the transport status of this server.

It is not possible to access the blog.kcoffee.net/abc.php directly with file_get_contents because it may have been repeatedly accessing a single server.

Instead, access http://72.249.146.213/abc.php, http://72.249.146.214/abc.php, http://72.249.146.215/ Abc.php method, it is not possible to have multiple virtual hosts on a Web server in these three servers.

Not by setting up the local hosts, because hosts cannot set multiple IPs for the same domain name.

That's only possible with PHP and http: When you access abc.php, add the blog.kcoffee.net domain name to the header. So, I wrote the following PHP function.

The following is the referenced content: /************************ * Function use: When the same domain name corresponds to multiple IPs, get the Remote Web page content of the specified server * Date Created: 2008-12-09 * Created by: Zhang Yi (blog.s135.com) * Parameter Description: * $ip The IP address of the server * The host name of the $host server * The URL address of the $url server (excluding domain name) * Return value: * Access to the Remote Web page content * False access to Remote Web page failed ************************/ function Httpvisit ($ip, $host, $url) { $errstr = "; $errno = "; $fp = Fsockopen ($ip, $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); Remove header information $pos = Strpos ($response, "\r\n\r\n"); $response = substr ($response, $pos + 4); return $response; } } Call Method: $server _info1 = httpvisit ("72.249.146.213", "blog.s135.com", "/abc.php"); $server _info2 = httpvisit ("72.249.146.214", "blog.s135.com", "/abc.php"); $server _info3 = httpvisit ("72.249.146.215", "blog.s135.com", "/abc.php"); ?>

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