?
Solved

Detecting google in the referer

Posted on 2009-05-17
4
Medium Priority
?
424 Views
Last Modified: 2012-05-07
I have some code that grabs the referering pages referer url and parses it to detect whether it has the string google in it. However it doesnt seem to detect it. Can some look at my code and give a suggestion on how to make it better.


$referer = $_SERVER['HTTP_REFERER'];
 
  //Did they get here from a search?
  if((preg_match('/www\.google.*/i',$referer) && !preg_match('/^http:\/\/www\.google\.com\//i', $referer))
     || preg_match('/search\.atomz.*/i',$referer)
     || preg_match('/search\.msn.*/i',$referer)
     || preg_match('/search\.yahoo.*/i',$referer)
     || preg_match('/msxml\.excite\.com/i', $referer)
     || preg_match('/search\.lycos\.com/i', $referer)
     || preg_match('/www\.alltheweb\.com/i', $referer)
     || preg_match('/search\.aol\.com/i', $referer)
     || preg_match('/search\.iwon\.com/i', $referer)
     || preg_match('/ask\.com/i', $referer)
     || preg_match('/search\.cometsystems\.com/i', $referer)
     || preg_match('/www\.hotbot\.com/i', $referer)
     || preg_match('/www\.overture\.com/i', $referer)
     || preg_match('/www\.metacrawler\.com/i', $referer)
     || preg_match('/search\.netscape\.com/i', $referer)
     || preg_match('/www\.looksmart\.com/i', $referer)
     || preg_match('/go\.google\.com/i', $referer)
     || preg_match('/dpxml\.webcrawler\.com/i', $referer)
     || preg_match('/search\.earthlink\.net/i', $referer)
     || preg_match('/search\.viewpoint\.com/i', $referer)
     || preg_match('/www\.mamma\.com/i', $referer)
     || preg_match('/home\.bellsouth\.net\/s\/s\.dll/i', $referer)
     || preg_match('/www\.ask\.co\.uk/i', $referer)) {
 
Echo "Search Engine Detected";
 
}
 
Here is the value of the referer varibale.
 
http://www.google.com/search?client=safari&rls=en-us&q=Danbury+CT+chive&ie=UTF-8&oe=UTF-8

Open in new window

0
Comment
Question by:MayoorPatel
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
4 Comments
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 24407843
Make a function with an array of the things you want to match.  I will post an example in  a few moments. ~Ray
0
 
LVL 111

Accepted Solution

by:
Ray Paseur earned 2000 total points
ID: 24407966
HTH, ~Ray
<?php // RAY_check_refer.php
error_reporting(E_ALL);
 
// REQUIRED READING: http://en.wikipedia.org/wiki/List_of_search_engines
 
// FOR THIS TEST CASE EXAMPLE ONLY WE SET THE REFERER TO A KNOWN VALUE
// $_SERVER["HTTP_REFERER"] = 'http://www.google.com/search?client=safari&rls=en-us&q=Danbury+CT+chive&ie=UTF-8&oe=UTF-8';
 
 
 
 
// TEST THE REFERER - WILL THROW NOTICE IF UNDEFINED
if (is_search_engine())  echo "    SEARCH ENGINE: {$_SERVER["HTTP_REFERER"]}";
if (!is_search_engine()) echo "NOT SEARCH ENGINE: {$_SERVER["HTTP_REFERER"]}";
 
 
 
// FUNCTION TO CHECK FOR SEARCH ENGINE REFERRAL
function is_search_engine()
{
// IF NOT REFERED
    if (empty($_SERVER["HTTP_REFERER"])) return FALSE;
 
// A LIST OF SELECTED SEARCH ENGINES
    $r = array();
    $r[] = '/google\.*/i';
    $r[] = '/search\.atomz.*/i';
    $r[] = '/search\.msn.*/i';
    $r[] = '/search\.yahoo.*/i';
    $r[] = '/msxml\.excite\.com/i';
    $r[] = '/search\.lycos\.com/i';
    $r[] = '/www\.alltheweb\.com/i';
    $r[] = '/search\.aol\.com/i';
    $r[] = '/search\.iwon\.com/i';
    $r[] = '/ask\.com/i';
    $r[] = '/search\.cometsystems\.com/i';
    $r[] = '/www\.hotbot\.com/i';
    $r[] = '/www\.overture\.com/i';
    $r[] = '/www\.metacrawler\.com/i';
    $r[] = '/search\.netscape\.com/i';
    $r[] = '/www\.looksmart\.com/i';
    $r[] = '/go\.google\.com/i';
    $r[] = '/dpxml\.webcrawler\.com/i';
    $r[] = '/search\.earthlink\.net/i';
    $r[] = '/search\.viewpoint\.com/i';
    $r[] = '/www\.mamma\.com/i';
    $r[] = '/home\.bellsouth\.net\/s\/s\.dll/i';
    $r[] = '/www\.ask\.co\.uk/i';
 
// TEST IF THIS IS A SEARCH ENGINE
    foreach ($r as $regex_string)
    {
        if (preg_match($regex_string, $_SERVER["HTTP_REFERER"])) return TRUE;
    }
 
// NOT A SEARCH ENGINE
    return FALSE;
}

Open in new window

0
 
LVL 1

Author Closing Comment

by:MayoorPatel
ID: 31582435
Excellent
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 25144991
Thanks for the points!  It's a good question, ~Ray
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Popularity Can Be Measured Sometimes we deal with questions of popularity, and we need a way to collect opinions from our clients.  This article shows a simple teaching example of how we might elect a favorite color by letting our clients vote for …
Password hashing is better than message digests or encryption, and you should be using it instead of message digests or encryption.  Find out why and how in this article, which supplements the original article on PHP Client Registration, Login, Logo…
The viewer will learn how to count occurrences of each item in an array.
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …
Suggested Courses

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question