---
title: Overview
description: "**PHP: Hypertext Preprocessor**, known as PHP, is a server-side scripting language. In order for the i2b2 Web Client to function properly, PHP has to be installed on your web server. - If your web server is running a Linux or…"
url: "https://i2b2.org/docs/2-5-3-php/"
updated: "2026-09-15"
category: i2b2 Installation Guide / Chapter 2. Requirements / 2.5 Web Server Requirements / 2.5.3 PHP
---

# Overview

**PHP: Hypertext Preprocessor**, known as PHP, is a server-side scripting language. In order for the i2b2 Web Client to function properly, PHP has to be installed on your web server.

- If your web server is running a Linux or MacOS operating system you can proceed to the section titled *PHP for Linux*.
- If your web server is running a Microsoft operating system you can proceed to the section titled *PHP for Windows*.