javascript-How to open an HTML page in a new window with a function written in this PHP page

javascriptphp

Title: I am writing a login + registration page, they let me write everything in a php file, I put the login page as a function, register
The page is written as a function. The question is how to click on a button in the login screen to open the registration page in a new window. is how
Call the function of the registration page??
I use JS probably written in this way. But no effect. Ask the Great God!!!
soory! Do not send pictures. For the first time, there is no coin. We will do the next

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