how can get google search result

How can I get the result of search in Google search, but without using the API.

I've tried many ways, but Google detects the ip server and prints an error. The function I use:

fopen
fsocket
...

For example this开发者_C百科 function can get html from other web sites, but for Google search, Google returns an error.

Is there a way I can get search results from Google?

function openpage($ur)
{
  $buf="";  
  $ur=str_replace(" ","+",$ur);

  $fp = fopen($ur, "rb");     
  if ($fp) 
        {
        while(!feof($fp)) $buf=$buf.fgets($fp);
        fclose($fp);
        }
return $buf;    
}

I have done a small project about it before. I used HTMLagilitypack.

Here is the source you can check it.

https://github.com/serdarb/Google-Results https://github.com/serdarb/Google-Results/blob/master/frmMain.cs

HtmlAgilityPack.HtmlNodeCollection hrefList = htmlDoc.DocumentNode.SelectNodes("//div//ol//li[@class='g']//h3//a");

But do not send to many requests... Google asks for a captcha or returns error.