* $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", "img.jb51.net", "/abc.php");
$server_info2 = HttpVisit("72.249.146.214", "img.jb51.net", "/abc.php");
$server_info3 = HttpVisit("72.249.146.215", "img.jb51.net", "/abc.php");
?>