geting a token from a web service with PHP

Dear Experts, I need to get a token from a web server.
how can I get the token? The url is https

Method : GET
Authorization  Type : oauth2
Grant Type : password
Content-Type : application/x-www-form-urlencoded
RequestUrl : https://myurl...
username : myusername
password : mypassword
client_Id : myclient_Id

from this web service
access_token, token_type, expires_in ( all of them are strings ) will return to me.

how can I get the token from this web service?
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David FavorLinux/LXD/WordPress/Hosting SavantCommented: provides an OAuth2 library used in many applications, along with a discussion of how to use the library to connect to OAuth2 API services.
David FavorLinux/LXD/WordPress/Hosting SavantCommented: is the Google OAuth2 client library, if you prefer.

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BRMarketingAuthor Commented:
thank you
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