silverstripe-framework/docs/en/02_Developer_Guides/04_Configuration/01_SiteConfig.md

SiteConfig: Global database content

Introduction

The [api:SiteConfig] panel provides a generic interface for managing site wide settings or functionality which is used throughout the site. Out of the box it provides 2 fields 'Site Name' and 'Site Tagline'.

Accessing [api:SiteConfig] Options

You can access [api:SiteConfig] options from any SS template by using the function $SiteConfig.FieldName

:::ss
$SiteConfig.Title 
$SiteConfig.Tagline

// or 

<% with $SiteConfig %>
$Title $AnotherField
<% end_with %>

Or if you want to access variables in the PHP you can do

:::php
$config = SiteConfig::current_site_config(); 
$config->Title

Extending [api:SiteConfig]

To extend the options available in the panel you can define your own fields via an Extension.

Create a mysite/code/CustomSiteConfig.php file.

:::php
<?php

class CustomSiteConfig extends DataExtension {
	
	private static $db = array(
		'FooterContent' => 'HTMLText'
	);

	public function updateCMSFields(FieldList $fields) {
		$fields->addFieldToTab("Root.Main", new HTMLEditorField("FooterContent", "Footer Content"));
	}
}

Then activate your extension in your config.yml file.

:::yml
SiteConfig:
  extensions:
    - CustomSiteConfig

This tells SilverStripe to add the CustomSiteConfig extension to the [api:SiteConfig] class.

After adding those two pieces of code, rebuild your database by visiting http://localhost/dev/build and then reload the admin interface. You may need to reload it with a ?flush=1 on the end.

You can define as many extensions for [api:SiteConfig] as you need. For example if you are developing a module you can define your own global settings for the dashboard.

API Documentation

[api:SiteConfig]