SameSite session cookie prop should behave like other INI settings

It should warn if the INI setting is changed after headers are sent or a session is not active

Author: Girgias

ext/session/session.c

@@ -811,7 +811,7 @@ PHP_INI_BEGIN()
 	STD_PHP_INI_ENTRY("session.cookie_domain",      "",          PHP_INI_ALL, OnUpdateSessionString, cookie_domain,      php_ps_globals,    ps_globals)
 	STD_PHP_INI_ENTRY("session.cookie_secure",      "0",         PHP_INI_ALL, OnUpdateSessionBool,   cookie_secure,      php_ps_globals,    ps_globals)
 	STD_PHP_INI_ENTRY("session.cookie_httponly",    "0",         PHP_INI_ALL, OnUpdateSessionBool,   cookie_httponly,    php_ps_globals,    ps_globals)
-	STD_PHP_INI_ENTRY("session.cookie_samesite",    "",          PHP_INI_ALL, OnUpdateString,        cookie_samesite,    php_ps_globals,    ps_globals)
+	STD_PHP_INI_ENTRY("session.cookie_samesite",    "",          PHP_INI_ALL, OnUpdateSessionString, cookie_samesite,    php_ps_globals,    ps_globals)
 	STD_PHP_INI_ENTRY("session.use_cookies",        "1",         PHP_INI_ALL, OnUpdateSessionBool,   use_cookies,        php_ps_globals,    ps_globals)
 	STD_PHP_INI_ENTRY("session.use_only_cookies",   "1",         PHP_INI_ALL, OnUpdateSessionBool,   use_only_cookies,   php_ps_globals,    ps_globals)
 	STD_PHP_INI_ENTRY("session.use_strict_mode",    "0",         PHP_INI_ALL, OnUpdateSessionBool,   use_strict_mode,    php_ps_globals,    ps_globals)