XL2TP configuration manager gives you ability to work with a configuration of your services in OOP style.
composer require evilfreelancer/xl2tp-php
Script below
$obj = new \XL2TP\Config();
$obj->global->port = 123;
$obj->global->authFile = '/etc/auth/file';
$obj->global->accessControl = 'yes';
$obj->lns->exclusive = 'yes';
$obj->lns->lac = 'awesome';
$obj->lns->assignIp = '192.168.1.1';
// Another way for setting section parameters
$obj->lns()->callRws = 'yes';
$obj->lns()->challenge = 'no';
$obj->lns('test')->exclusive = 'yes';
$obj->lns('test')->lac = 'awesome';
$obj->lns('test')->assignIp = '192.168.1.1';
$obj->lac->redial = 123;
$obj->lac->maxRedial = 1;
$obj->lac->lns = 'test';
$obj->lac('awesome')->redial = 123;
$obj->lac('awesome')->maxRedial = 1;
$obj->lac('awesome')->lns = 'test';
echo $obj->generate();Will generate following INI configuration
[global]
port = 123
auth file = "/etc/auth/file"
access control = "yes"
[lns default]
exclusive = "yes"
lac = "awesome"
assign ip = "192.168.1.1"
call rws = "yes"
challenge = "no"
[lns test]
exclusive = "yes"
lac = "awesome"
assign ip = "192.168.1.1"
[lac default]
redial = 123
max redial = 1
lns = "test"
[lac awesome]
redial = 123
max redial = 1
lns = "test"