You have it already :)

    $_POST

_POST is enough ? Why $ here ?

Are you... asking when you'll get a feature in PHP while not knowing it employs sigils on variable names?

Maybe, it's redundant to waste my seconds of life.

One second to write.

Some seconds to read and parse those $$$.

What a bizarre attitude to have. You could also save tons of seconds by not using indents in Python or brackets in JS. But then you would also not have working code.

Yes, it's outrageous that it's taken so long to implement React-specific functions in PHP!

Just use `$_SESSION`.