silverstripe-framework/docs/en/02_Developer_Guides/05_Extending/index.md

---
title: Extending SilverStripe
summary: Understand the ways to modify the built-in functionality through Extensions, Subclassing and Dependency Injection.
introduction: SilverStripe is easily extensible to meet custom application requirements. This guide covers the wide range of API's to modify built-in functionality and make your own code easily extensible.
icon: code
---

No two applications are ever going to be the same and SilverStripe is built with this in mind. The core framework 
includes common functionality and default behaviors easily complemented with add-ons such as modules, widgets and 
themes. 

SilverStripe includes a myriad of extension API's such as *Extension Hooks* and support for programming patterns 
such as *Dependency Injection*. Allowing developers to tailor the framework to their needs without modifying the core 
framework.

[CHILDREN Exclude="How_Tos"]

## How to's

[CHILDREN Folder="How_Tos"]
NEW: Update docs to be compliant with Gatsby site (#9314) * First cut * Temporarily disable composer.json for netlify build * POC * New recursive directory query, various refinements * Fix flexbox * new styled components plugin * Apply frontmatter delimiters * Mobile styles, animation * Search * Redesign, clean up * Nuke the cache, try again * fix file casing * Remove production env file * ID headers * Move app to new repo * Add frontmatter universally * Hide children changelogs * Add how to title * New callout tags * Revert inline code block change * Replace note callouts * Fix icons * Repalce images * Fix icon * Fix image links * Use proper SQL icon 2019-11-18 05:58:33 +01:00			`---`
Add introduction files to each of the sections 2014-09-21 02:07:58 +02:00			`title: Extending SilverStripe`
			`summary: Understand the ways to modify the built-in functionality through Extensions, Subclassing and Dependency Injection.`
Review and clean up of extending section 2014-10-22 12:47:56 +02:00			`introduction: SilverStripe is easily extensible to meet custom application requirements. This guide covers the wide range of API's to modify built-in functionality and make your own code easily extensible.`
NEW: Update docs to be compliant with Gatsby site (#9314) * First cut * Temporarily disable composer.json for netlify build * POC * New recursive directory query, various refinements * Fix flexbox * new styled components plugin * Apply frontmatter delimiters * Mobile styles, animation * Search * Redesign, clean up * Nuke the cache, try again * fix file casing * Remove production env file * ID headers * Move app to new repo * Add frontmatter universally * Hide children changelogs * Add how to title * New callout tags * Revert inline code block change * Replace note callouts * Fix icons * Repalce images * Fix icon * Fix image links * Use proper SQL icon 2019-11-18 05:58:33 +01:00			`icon: code`
			`---`
Add introduction files to each of the sections 2014-09-21 02:07:58 +02:00
Review and clean up of extending section 2014-10-22 12:47:56 +02:00			`No two applications are ever going to be the same and SilverStripe is built with this in mind. The core framework`
			`includes common functionality and default behaviors easily complemented with add-ons such as modules, widgets and`
			`themes.`
Add introduction files to each of the sections 2014-09-21 02:07:58 +02:00
Review and clean up of extending section 2014-10-22 12:47:56 +02:00			`SilverStripe includes a myriad of extension API's such as Extension Hooks and support for programming patterns`
Update index.md (#4020) MINOR: wording correction 2016-09-29 02:21:17 +02:00			`such as Dependency Injection. Allowing developers to tailor the framework to their needs without modifying the core`
Review and clean up of extending section 2014-10-22 12:47:56 +02:00			`framework.`
Add introduction files to each of the sections 2014-09-21 02:07:58 +02:00
Review and clean up of extending section 2014-10-22 12:47:56 +02:00			`[CHILDREN Exclude="How_Tos"]`

			`## How to's`

Update index.md (#4020) MINOR: wording correction 2016-09-29 02:21:17 +02:00			`[CHILDREN Folder="How_Tos"]`