[pkg-php-pear] Example to package composer package

[Fab]

Hello,

How to package a composer package for Debian? I've seen that there is 
dh_phpcomposer in pkg-php-tools and [1], but how to use it, name the 
package...
What about the dependencies? Will they be packaged automatically, or will the 
dependencies be automatically added?

Can you recommend an existing Debian package that I could use as a base? Or 
maybe some additional documentation?

I would need three packages [2] and I can't find them in Debian.

[1]: https://sources.debian.org/src/pkg-php-tools/1.42/debian/README.Composer/

[2]: https://packagist.org/packages/codeigniter/framework
https://packagist.org/packages/paragonie/random_compat
https://packagist.org/packages/kissifrot/php-ixr

Thanks
Fab