Laravel - Homestead issue

I read tutorials on net and try to start using laravel but first I need to install homestead... I do everything like I read but pease help me with this:

MY SCREENSHOOT

why at every command I get 'php' is not reconizes as an internal ... ...

Please help, i'm new to homestead and laravel, before thi question I try almost everything... Why I get this messages at CMD? What is wrong here?

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