How to identify a mobile phone with 100% probability?

Question

PHP

Hello dear experts!
Actually the question is in the subject, but there is a nuance - desktop Chrome has such a feature joxi.ru/bmoqwkkixyq09A.png
It emulates both the user agent, and the mobile screen size, and the orientation, and the touchscreen.
Are there any options for detecting such a situation?

Answer 1

https://stackoverflow.com/a/28084346
But in general, not the fact that everything is so simple.

Answer 2

With 100% probability - no way

Answer 3

we do so

export const isMobile = () => {
    if (navigator.userAgent.match(/Android/i)
        || navigator.userAgent.match(/webOS/i)
        || navigator.userAgent.match(/iPhone/i)
        || navigator.userAgent.match(/iPad/i)
        || navigator.userAgent.match(/iPod/i)
        || navigator.userAgent.match(/BlackBerry/i)
        || navigator.userAgent.match(/Windows Phone/i)
    ) {
        return true;
    }
    else {
        return false;
    }
};

Answer 4

No way. The main problem is emulators (or VMs), which in all aspects, including OS, user-agent, screen resolution and even hardware, are mobile phones for an outside observer, in fact - a virtual environment can be executed anywhere.