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php-protocolbuffers provides Fast and Robust protocol buffers serializer and deserializer into PHP.

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• API
• protoc-gen-php

Supported Platforms

• Linux like OS
• Windows

Features

Standard types (numbers, string, enums, messages, etc)	supported
Repeated fields	supported
Packed attributes	supported
Extensions	alpha
Unknown fields	beta
Service (RPC)	not supported yet
64bit values	EXPERIMENTAL

PHP specific features

• __sleep and __wakeup method support.

You can use above magic methods when enabling UseWakeupAndSleep flag. Be careful, this feature is not part of protocolbuffers specification. these method will call when parseFromString and serializeToString (also supports ProtocolBuffers::decode and ProtocolBuffers::encode)

$phpoptions = $descriptor_builder->getOptions()->getExtension(ProtocolBuffers::PHP_MESSAGE_OPTION);
$phpoptions->setUseWakeupAndSleep(true); // default is off
$descriptor = $descriptor_builder->build();