Get keyword from a (search engine) referrer url using PHP - php

Question

I am trying to get the search keyword from a referrer url. Currently, I am using the following code for Google urls. But sometimes it is not working...
$query_get = "(q|p)";
$referrer = "http://www.google.com/search?hl=en&q=learn+php+2&client=firefox";
preg_match('/[?&]'.$query_get.'=(.*?)[&]/',$referrer,$search_keyword);
Is there another/clean/working way to do this?
Thank you,
Prasad

Answer 1

If you're using PHP5 take a look at http://php.net/parse_url and http://php.net/parse_str
Example:
// The referrer
$referrer = 'http://www.google.com/search?hl=en&q=learn+php+2&client=firefox';
// Parse the URL into an array
$parsed = parse_url( $referrer, PHP_URL_QUERY );
// Parse the query string into an array
parse_str( $parsed, $query );
// Output the result
echo $query['q'];

Answer 2

There are different query strings on different search engines. After trying Wiliam's method, I have figured out my own method. (Because, Yahoo's is using 'p', but sometimes 'q')
$referrer = "http://search.yahoo.com/search?p=www.stack+overflow%2Ccom&ei=utf-8&fr=slv8-msgr&xargs=0&pstart=1&b=61&xa=nSFc5KjbV2gQCZejYJqWdQ--,1259335755";
$referrer_query = parse_url($referrer);
$referrer_query = $referrer_query['query'];
$q = "[q|p]"; //Yahoo uses both query strings, I am using switch() for each search engine
preg_match('/'.$q.'=(.*?)&/',$referrer,$keyword);
$keyword = urldecode($keyword[1]);
echo $keyword; //Outputs "www.stack overflow,com"
Thank you,
Prasad

Answer 3

To supplement the other answers, note that the query string parameter that contains the search terms varies by search provider. This snippet of PHP shows the correct parameter to use:
$search_engines = array(
'q' => 'alltheweb|aol|ask|ask|bing|google',
'p' => 'yahoo',
'wd' => 'baidu',
'text' => 'yandex'
);
Source: http://betterwp.net/wordpress-tips/get-search-keywords-from-referrer/

Answer 4

<?php
class GET_HOST_KEYWORD
{
public function get_host_and_keyword($_url) {
$p = $q = "";
$chunk_url = parse_url($_url);
$_data["host"] = ($chunk_url['host'])?$chunk_url['host']:'';
parse_str($chunk_url['query']);
$_data["keyword"] = ($p)?$p:(($q)?$q:'');
return $_data;
}
}
// Sample Example
$obj = new GET_HOST_KEYWORD();
print_r($obj->get_host_and_keyword('http://www.google.co.in/search?sourceid=chrome&ie=UTF-&q=hire php php programmer'));
// sample output
//Array
//(
// [host] => www.google.co.in
// [keyword] => hire php php programmer
//)
// $search_engines = array(
// 'q' => 'alltheweb|aol|ask|ask|bing|google',
// 'p' => 'yahoo',
// 'wd' => 'baidu',
// 'text' => 'yandex'
//);
?>

Answer 5

$query = parse_url($request, PHP_URL_QUERY);

Answer 6

This one should work For Google, Bing and sometimes, Yahoo Search:
if( isset($_SERVER['HTTP_REFERER']) && $_SERVER['HTTP_REFERER']) {
$query = getSeQuery($_SERVER['HTTP_REFERER']);
echo $query;
} else {
echo "I think they spelled REFERER wrong? Anyways, your browser says you don't have one.";
}
function getSeQuery($url = false) {
$segments = parse_url($url);
$keywords = null;
if($query = isset($segments['query']) ? $segments['query'] : (isset($segments['fragment']) ? $segments['fragment'] : null)) {
parse_str($query, $segments);
$keywords = isset($segments['q']) ? $segments['q'] : (isset($segments['p']) ? $segments['p'] : null);
}
return $keywords;
}

Answer 7

I believe google and yahoo had updated their algorithm to exclude search keywords and other params in the url which cannot be received using http_referrer method.
Please let me know if above recommendations will still provide the search keywords.
What I am receiving now are below when using http referrer at my website end.
from google: https://www.google.co.in/
from yahoo: https://in.yahoo.com/
Ref: https://webmasters.googleblog.com/2012/03/upcoming-changes-in-googles-http.html