2019-10-18-composer-require-waring

Deprecation warning: Your package name dxsys is invalid

composer 版本：version 1.8.4

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composer require vendorName/packageName

Deprecation warning: Your package name dxsys is invalid, it should have a vendor name, a forward slash, and a package name. 
The vendor and package name can be words separated by -, . or _. 
The complete name should match "[a-z0-9]([_.-]?[a-z0-9]+)*/[a-z0-9]([_.-]?[a-z0-9]+)*". 
Make sure you fix this as Composer 2.0 will error.

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composer selfupdate

Updating to version 1.9.0 (stable channel).
   Downloading (100%)
Use composer self-update --rollback to return to version 1.8.4