Setting Cookie Secure Flag – PHP

Method #1 By using ini_set function

Add the following code on the page

ini_set("session.cookie_secure", 1);

Method #2 By using session_set_cookie_params function

Add the following code on the page:

session_set_cookie_params(0, NULL, NULL, TRUE, NULL);

Method #3 By using setcookie function

Add the following code when creating cookie:

setcookie("name", "value", NULL, NULL, NULL, TRUE, NULL);

References

https://www.owasp.org/index.php/SecureFlag
http://php.net/manual/en/function.setcookie.php
http://php.net/manual/en/function.session-set-cookie-params.php