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Buddy,
Vuejs is a front-end framework.What it means is, When you do npm run build then it will create bunch of js and html/css/image files on the server.Then you require a web server to server these files.
When you hit the url on your web-browser then all these files will download into
the web-browser and then execute over there.This is how front-end framework works in a nutshell.
PHP is a back-end scripting language.Which means it require back-end php engine to run and execute the code logic.So it has nothing to do with vuejs that is running on your web-browser.
Best possible way to connect these 2 applications is via API.You should request data from a php API which is running on back-end web server.
fetch('http://localhost/GetSQLData.php?table=Clients&columns=top%2010ClientID')