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-This directory contains the Protocol Buffers runtime implementation via both a
-pure PHP package and a native c extension. The pure PHP package is intended to
-provide usability to wider range of PHP platforms, while the c extension is
-intended to provide higher performance. Both implementations provide the same
-runtime APIs and share the same generated code. Users don’t need to re-generate
-code for the same proto definition when they want to switch the implementation
-later.
-
-Both implementations make use of generated PHP code that defines message and
-enum types in PHP. We strongly recommend using protoc's PHP generation support
-with .proto files. The build process in this directory only installs the
-extension/package; you need to install protoc as well to have PHP code
-generation functionality.
-
-## Requirements
-
-To use PHP runtime library requires:
-
-- C extension: PHP 5.5.x or 5.6.x.
-- PHP package: PHP 5.5, 5.6 or 7.
-
-## Installation
-
-### C Extension
-
-#### Prerequirements
-
-To install the c extension, the following tools are needed:
-* autoconf
-* automake
-* libtool
-* make
-* gcc
-* pear
-* pecl
-
-On Ubuntu, you can install them with:
-```
-sudo apt-get install php-pear php5-dev autoconf automake libtool make gcc
-```
-On other platforms, please use the corresponding package managing tool to
-install them before proceeding.
-
-#### Installation from Source (Building extension)
-
-To build the c extension, run the following command:
-```
-cd ext/google/protobuf
-pear package
-sudo pecl install protobuf-{VERSION}.tgz
-```
-
-#### Installation from PECL
-
-When we release a version of Protocol Buffers, we will upload the extension to
-[PECL](https://pecl.php.net/). To use this pre-packaged extension, simply
-install it as you would any other extension:
-
-```
-sudo pecl install protobuf-{VERSION}
-```
-
-### PHP Package
-
-#### Installation from composer
-
-Simply add "google/protobuf" to the 'require' section of composer.json in your
-project.
-
-### Protoc
-
-Once the extension or package is installed, if you wish to generate PHP code
-from a `.proto` file, you will also want to install the Protocol Buffers
-compiler (protoc), as described in this repository's main `README` file.  The
-version of `protoc` included in the latest release supports the `--php_out`
-option to generate PHP code:
-```
-protoc --php_out=out_dir test.proto
-```
-
-## Usage
-
-For generated code:
-  https://developers.google.com/protocol-buffers/docs/reference/php-generated
-
-Known Issues
-------------
-
-* Missing native support for well known types.
-* Missing support for proto2.
-* No API provided for clear/copy messages.
-* No API provided for encoding/decoding with stream.
-* Map fields may not be garbage-collected if there is cycle reference.
-* No debug information for messages in c extension.
-* HHVM not tested.
-* C extension not tested on windows, mac, php 7.0.
-* Message name cannot be Empty.