Request to Contribute PHP Algorithm sample code

[Mohammadreza-73]

I'm excited to contribute to this project.
I'd love to help by adding well-documented PHP implementations of common algorithms to the codebase.

[Mohammadreza-73]

@krahets
According to this #15 issue, you agree with this idea.

[krahets]

Hi @Mohammadreza-73, thank you for your interest in contributing to this project. Feel free to create PRs to translate the code to PHP.