Initial checkin of gRPC to third_party/

third_party/grpc/src/php/ext/grpc/README.md

Index: third_party/grpc/src/php/ext/grpc/README.md
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+gRPC PHP Extension
+==================
+
+# Requirements
+
+ * PHP 5.5+
+ * [gRPC core library](https://github.com/grpc/grpc) 0.11.0
+
+# Installation
+
+## Install PHP 5
+
+```
+$ sudo apt-get install git php5 php5-dev php-pear unzip
+```
+
+## Compile gRPC Core Library
+
+Clone the gRPC source code repository
+
+```
+$ git clone https://github.com/grpc/grpc.git
+```
+
+Build and install the gRPC C core libraries
+
+```sh
+$ cd grpc
+$ git checkout --track origin/release-0_11
+$ git pull --recurse-submodules && git submodule update --init --recursive
+$ make
+$ sudo make install
+```
+
+Note: you may encounter a warning about the Protobuf compiler `protoc` 3.0.0+ not being installed. The following might help, and will be useful later on when we need to compile the `protoc-gen-php` tool.
+
+```sh
+$ cd grpc/third_party/protobuf
+$ sudo make install   # 'make' should have been run by core grpc
+```
+
+## Install the gRPC PHP extension
+
+Quick install
+
+```sh
+$ sudo pecl install grpc
+```
+
+Note: before a stable release, you may need to do
+
+```sh
+$ sudo pecl install grpc-beta
+```
+
+OR
+
+Compile from source
+
+```sh
+$ # from grpc
+$ cd src/php/ext/grpc
+$ phpize
+$ ./configure
+$ make
+$ sudo make install
+```