php - What is pgv_si and pgv_pvi -

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i'm using phpv7, found there pgv_si , pgv_pvi. can't find them php.net official website. knows that?

the code below:

var_dump('cookie', $_cookie);

i understand generated cookie, don't know for...

those variables in cookies, set server. please read documentation on cookies, not have connection php itself.


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