PHP - 如何获取希伯来词的同义词列表？

I'm writing a php code. I want to show to the user a synonymslist for each hebrew word. How can I do it?

I tried this way:

$word = new COM("word.application") or die ("Could not initialise MS Word object."); 
$synonyms = $word->Application->SynonymInfo('שמח', 1037);

but I don't know how to continue? Thanks in advance!