Reopening a session in PHP

by 
session_start();
...
session_write_close();
...

ini_set('session.use_only_cookies', false);
ini_set('session.use_cookies', false);
ini_set('session.use_trans_sid', false);
ini_set('session.cache_limiter', null);
session_start(); // second session_start

This will prevent php from calling php_session_send_cookie() a second time.
See it working.

Though restructuring the scripts still seems to be the better option…

For PHP 7.2+, you will basically need to re-implement session cookies to avoid errors and warnings:

ini_set('session.use_only_cookies', false);
ini_set('session.use_cookies', false);
ini_set('session.use_trans_sid', false);
ini_set('session.cache_limiter', null);

if(array_key_exists('PHPSESSID', $_COOKIE))
    session_id($_COOKIE['PHPSESSID']);
else {
    session_start();
    setcookie('PHPSESSID', session_id());
    session_write_close();
}

session_start();
...
session_write_close();
...

session_start(); // second session_start

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