php - Keyword Extractor for Query Strings -

i've found few keyword extractors query strings, seem outdated (use deprecated code or don't work).

does know of php query string extractor. or how build function takes "host" "amazon.com" , names of multiple query parameters , returns values of parameters?

for instance, http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3daps&field-keywords=a+tale+of+two+cities&x=0&y=0

if provided "amazon.com" , "field-keywords" how can array: ['a','tale','of','two','cities'] ?

thanks in advance!!

clarification

jose's answer covers example amazon doesn't seem work other url:

http://www.bing.com/search?q=christmas+around+the+world&form=qblh&qs=pn&sk=hs1pn4&pq=&sp=6&sc=8-0

http://search.yahoo.com/search;_ylt=anqn0c997qr5siycyt.h2ycbvzx4?p=golf&toggle=1&cop=mss&ei=utf-8&fr=yfp-t-701

you (i) write one.

function getvaluefromdomain($urls, $domain, $key) {     foreach ($urls $url) {         if (preg_match('/https?:\/\/[^\/]*?' . preg_quote($domain) . '\//', $url)) {             parse_str(substr($url, strpos($url, '?') + 1), $output);             if (isset($output[$key])) {                 $array = explode(' ', $output[$key]);                 return $array;             }         }     }     return array(); } 

just tad of code stolen @jose's answer :)

update: tested, didn't work, fixed, works.

update 2: didn't work after all, tested, fixed, works.

update 3: added support https