synonymizer with api
juust | December 28, 2008If you want to put some old content on the net and have it indexed as fresh unique content, this works wonders for seo-friendly backlinks : the automated synonymizer. I want one that makes my content unique without having to type one character.
Lucky for me, mister John Watson’s synonym database comes with a free 10.000 request a day API and boy is it sweet!
API Requests are straightforward :
http://words.bighugelabs.com/api/2/[apikey]/[keyword]/xml
A number of return formats are supported but xml is easiest, either for parsing with simplexml or regular pattern matching.
It returns on request :
black (slightly shortened)
an xml file like :
<words>
<w p=”adjective” r=”syn”>bleak</w>
<w p=”adjective” r=”syn”>sinister</w>
<w p=”adjective” r=”sim”>dark</w>
<w p=”adjective” r=”sim”>angry</w>
<w p=”noun” r=”syn”>blackness</w>
<w p=”noun” r=”syn”>inkiness</w>
<w p=”verb” r=”syn”>blacken</w>
<w p=”verb” r=”syn”>melanize</w>
</words>
…which is easiest handled with preg_match_all :
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function getsynonyms($keyword) {
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$pick = array();
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$apikey = 'get your own key';
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$xml=file_get_contents('http://words.bighugelabs.com/api/2/'.$apikey.'/'.$keyword.'/xml');
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if(!$xml) return $pick; //return empty array
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preg_match_all('/<w p="adjective" r="syn">(.*?)< \/w>/', $xml, $adj_syns);
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//preg_match_all('/</w><w p="adjective" r="sim">(.*?)< \/w>/', $xml, $adj_sims);
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//preg_match_all('/</w><w p="noun" r="syn">(.*?)< \/w>/', $xml, $noun_syns);
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//preg_match_all('/</w><w p="verb" r="syn">(.*?)< \/w>/', $xml, $verb_syns);
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foreach($adj_syns[0] as $adj_syn) $pick[]=$adj_syn;
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//same for verb/noun synonyms, I just want adjectives
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return $pick;
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}
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</w>
practically applying it,
I take a slab of stale old content and…
- strip tags
- do a regular match on all alphanumeric sequences dropping other stuff
- trim the resulting array elements
- (merge all blog tags, categories, and a list of common words)
- excluding common terms from the array with text elements
- excluding words smaller than N characters
- set a percentage words to be synonimized
- attempt to retrieve synonyms for remaining terms
- replace these words in the original text, keep count
- when I reach the target replacement percentage, abort
- return (hopefully) a revived text
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function synonymize($origtext) {
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//make a copy of the original text to dissect
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$content=$origtext;
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//content = $this->body;
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$perc=3; //target percentage changed terms
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$minlength=4; //minimum length candidates
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$maxrequests=80; //max use of api-requests
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-
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//dump tags
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$content = strip_tags($content);
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//dump non-alphanumeric string characters
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$content = preg_replace('/[^A-Za-z0-9\-]/', ' ', $content);
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//explode on blank space
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$wrds = explode(' ', strtolower($content));
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//trim off blank spaces just in case
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for($w=0;$w<count ($wrds);$w++) $words[] = trim($wrds[$w]);
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//this should be all words
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$wordcount = count($words);
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//how many words do I want changed ?
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$toswitch = round($wordcount*$perc/100);
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//only use uniques
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$words_unique=array_unique($words);
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//sort, start with words at the end of the text
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sort($words_unique);
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//merge common with tags, categories, linked_tags
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$common = array("never", "about", "price");
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//note : setting the minlength to 4 excludes lots of common terms
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for($i=0;$i<count($words_unique);$i++) {
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//if in common array, not selectable for synonymizing
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if(in_array($words_unique[$i], $common)) {} else {
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//only terms bigger than minlength
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if(strlen($words_unique[$i])>$minlength) {
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//words_select contains candidates for synonyms
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$words_select[] = trim($words_unique[$i]);
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}
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}
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}
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//terms that can be changed
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$max = count($words_select);
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//no more requests than max
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if($max>$maxrequests) $max=$maxrequests;
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for($i=0;$i< $max;$i++) {
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//get synonyms, give server some time
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usleep(100000);
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//retrieve synonyms etc.
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$these_words = getsynonyms($words_select[$i]);
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$jmax=count($these_words);
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if($jmax<1) {
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//no results
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} else {
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$count=0;
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$j=0;
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//the replacements are done in the original text
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$origtext= preg_replace('/'.$words_select[$i].'/i', $these_words[$j], $origtext, -1, $count);
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$total_switched+=$count;
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} //have we reached the percentage ?
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if($total_switched>=$toswitch) break;
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}
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//okay!
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return $origtext;
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}
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function getsynonyms($keyword) {
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$pick=array ();
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$apikey = 'get your own key at bighugelabs.com';
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$xml=@file_get_contents('http://words.bighugelabs.com/api/2/'.$apikey.'/'.urlencode($keyword).'/xml');
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if(!$xml) return $pick;
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preg_match_all('/<w p="adjective" r="syn">(.*?)< \/w>/', $xml, $adj_syns);
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foreach($adj_syns[0] as $adj_syn) $pick[]=$adj_syn;
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return $pick;
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}
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</w></count>
Nothing fancy, a straightforward search-replace routine. A 1200 word text has about 150 candidates and for 3% synonyms I need to replace 36 words, it can do that. If I were to use it for real I would build a table with non-returning terms, and store often used terms, that would speed up the synonimizing, allow the use of preferences and take a load of the api use.
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