php - How to change the PHPSESSID cookie domain? -


i have 2 subdomains sub1.domain.com , sub2.domain.com

sub1 1 set login session session not shared because have different cookie domain

sub1's cookie domain => .sub1.domain.com  sub2's cookie domain => .sub2.domain.com 

option 1: change sub2's .sub2.domain.com .sub1.domain.com can share session

option 2: change sub1's .sub1.domain.com .domain.com

i want option 1 because we're trying avoid changes on sub1.domain.com , domain.com possible.

i have tried codes on sub2's end no luck

ini_set('session.cookie_domain', '.sub1.domain.com'); session_set_cookie_params (0,'/','.sub1.domain.com'); 

you cannot set session.cookie_domain different subdomain, can set .domain.com , visible on subdomains:

ini_set('session.cookie_domain', '.domain.com'); 

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