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1. Introduction

> With the development of Composer, developers will have easy to include another packages in their project.

> When they include a package into your project, it's likely to cause conflicts if the package overlap. 

2. Directory Struct

ParentComposer

|

|__src

|   |__ParentClass.php

|       |__//This class will two packages: 

|           |__{"trueme/child-composer": "dev-master"}

|           |__{"guzzlehttp/guzzle": "6.3.0"}

|

|

|__index.php

|

|__composer.json

3. Step by step do it

> You're staying ParentComposer project: https://github.com/truemenews/ParentComposer.git

> ParentComposer will have conflict when use: composer install/update to download packages above

    |__Your requirements could not be resolved to an installable set of packages.

Problem 1

- Installation request for trueme/child-composer dev-master -> satisfiable by trueme/child-composer[dev-master].

- trueme/child-composer dev-master requires guzzlehttp/guzzle 6.2.0 -> satisfiable by guzzlehttp/guzzle[6.2.0] 

              but these conflict with your requirements or minimum-stability.

> You need to change: {"guzzlehttp/guzzle": "6.3.0"} -> 6.2.0 to use it or remove this package 

    from composer.json. Composer will download {"guzzlehttp/guzzle": "6.2.0"} from composer.json 

    in ChildComposer project