I have a site on Yii 1.1.19 how to install a PHP library into it via Composer?

Question

Yii

There is a site on Yii 1.1.19, initially apparently not installed through Composer, now you need to add one lib to the project through Composer - how to do this?

Answer 1

Install manually
www.yiiframework.com/doc/guide/1.1/en/extension.use

Answer 2

How to add composer to Yii1 there is an instruction here