removed separate page and added trimmed content into the install page (#278)

* removed separate page and added trimmed content into the install page

* fix tabs

* Updated executable name

* add note about changing default port

Author: chris-hoefgen

docs/sdk/server-side-sdks/php/php-install.md

@@ -38,4 +38,54 @@ Download the files and include `autoload.php`:
 require_once('/path/to/DevCycle/vendor/autoload.php');
 ```
 
+## Local Bucketing Proxy
+
+Due to complexities with the PHP application lifecycle and state management, local bucketing functionality requires a different approach compared to the other server SDKS.
+
+To access this functionality in PHP, DevCycle provides a **proxy** process that can run alongside your PHP application or on a separate host in your environment. This proxy mimics the Cloud Bucketing API but provides for higher speed variable evaluations due to the reduction of network latency and config caching; all powered by DevCycle's high performance Go Server SDK.
+
+The local bucketing proxy can be downloaded as a binary or package from here: https://github.com/DevCycleHQ/local-bucketing-proxy/releases
+
+#### Proxy Configuration
+
+Once the proxy is downloaded and installed, it can be configured via either environment variables or command line arguments. See the [README](https://github.com/DevCycleHQ/local-bucketing-proxy#options) for the configuration options.
+
+At a minimum, you will need set the `DVC_LB_PROXY_SDK_KEY` environment variable to activate the proxy. This should be set to your SDK key for your PHP application.
+The rest of the values can be left unchanged for basic operation. This will default to starting an HTTP server on port **8080**. You can change the port with the `DVC_LB_PROXY_HTTP_PORT` environment variable.
+
+
+#### Running the Proxy
+
+The proxy can be started by just executing the binary:
+
+```bash
+
+$ devcycle-local-bucketing-proxy
+
+HTTP server started on port 8080
+
+```
+
+At this point the proxy is live and ready to accept requests from the PHP SDK.
+
+##### OS Packaged Version
+If you have installed an OS packaged version of the proxy - the binary will be installed to `/usr/bin/devcycle-local-bucketing-proxy`.
+
+You will need to configure a separate supervisor/orchestrator such as `systemd` or `upstart` if no you need to create a long-lived process.
+
+#### PHP SDK Configuration
+Once the local bucketing proxy is up and running, you will need to update the configuration for your PHP SDK to point at the proxy host.
+
+The default configuration of the proxy will start run at `localhost:8080` and the PHP SDK would be setup as follows:
+
+```php
+$config = DevCycle\Configuration::getDefaultConfiguration()
+    ->setApiKey('Authorization', $_ENV["DVC_SERVER_SDK_KEY"])
+    ->setHost("http://localhost:8080");
+```
+
+No other configuration is necessary. Ensure that the local bucketing proxy process is running before the PHP application makes a request to it.
+
+
+