You can now write TL serializers in PHP

[hrissan]

Functions to implement by PHP serializers.

interface RpcFunction {
...
  public function getTLFunctionMagic() : int;
  public function customStore() : RpcFunctionFetcher;
  public function customFetch() : RpcFunctionFetcher;

They should either store/fetch function and return instance of RpcFunctionFetcher, or do nothing and return null, in this case runtime will call C++ serializer.

interface RpcFunctionFetcher {
  public function typedFetch() : RpcFunctionReturnResult;
  public function typedStore($result ::: RpcFunctionReturnResult);
}