javascript - Session not working on new server -

i have site changes whenever new location changed. location choices using drop down. , on change calls function:

    function prod_change_loc() {       location_change = document.getelementbyid("prod_sel_loc").value;       varurl = "http://" + varserveraddr +         "/hourly_ft_wip/production_line/prod_line_loc.php?location_change=" +         location_change, load(varurl, "location");        settimeout(function() {         location.reload();       }, 100);     } 

prod_line_loc.php contains:

session_start(); $_session['hourly_ft_wip']['prod_loc'] = $_request['location_change']; $_session['hourly_ft_wip']['prod_tester'] = 'all'; 

and returns main page sets location using this:

if(!isset($_session['hourly_ft_wip']['prod_loc'])){     $_session['hourly_ft_wip']['prod_loc'] = 'eolphl'; } else{     $_session['hourly_ft_wip']['prod_loc'] = $_session['hourly_ft_wip']['prod_loc']; } 

this working in our server, had transfer new server , session changed. doesn't. there settings might affect this?

the difference see in them in our old server located in var/www/folder in our new server located in var/www/html/folder

also reason have sleep function doesn't work in firefox without that.

as stated:

session_start(); 

needs on every php page; in cases embedding ajax calls needs on ajax/php pages.

you can use:

session_name(); 

if want make sure using same session

you can use database storage sessions may fit more within means.

as edit:

    if(!isset($_session)) {    session_start();  } 

this should on every page. if session has been started wont come error if not start. way wont lose session between pages.