[database]
host = localhost
user = vki
pass = titok
name = vmi

$config = parse_ini_file('config.ini');
$host = $config['host'];
$user = $config['user'];
$pass = $config['pass'];
$name = $config['name'];
...

<?php
 
define('HOST', 'localhost');
define('USER', 'vki');
define('PASS', 'titok');
define('DBNAME', 'vmi'); 

<?php
 
function csinal() {
    $host = HOST;
    ...
}

<?php
 
$db['host'] = 'localhost';
$db['user'] = 'vki';
$db['pass'] = 'titok';
$db['name'] = 'vmi';

<?php
 
function csinal() {
    global $db;
    $host = $db['host'];
    ...
}