php sessions

hello,
if all my pages initiate a session, would this hurt my page indexing? I need to use the session in all the pages (as I am showing if the person is logged in or not at the bottom of every page)....

using sessions is not going to hurt your search engine optimization. May websites contain information with sessions enabled. Consider a crawler to almost be a human that takes a look at the html setup of the page. Meaning, before the crawler walks the site, it will load the page information first then continue to analyze the HTML data. If all your HTML code is up to standards and you have good Open and Close brackets your website will present the information correctly, and so, the crawlers will take note of this.