PHP : How can I logout a user from all open tabs automatically when user logs out in one of them?

PHP : How can I logout a user from all open tabs automatically when user logs out in one of them?
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As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Next, enter the letters 'awesome' on your keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

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PHP : How can I logout a user from all open tabs automatically when user logs out in one of them?
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