I have a dynamically generated PHP web page where I change randomly the page <title> and <h1> by synonyms.Will search engines index the page for all or just for one synonym? Is it good option in terms of SEO?
Synonyms and SEO
seo;change frequency
It's going to index whatever it sees when it crawls the page. So one day it may be one word and the next day another. So this really isn't going to do anything for you. If you want to improve your rankings for the synonyms you should find a way to work them into your copy. That way they are all there, all the time.