I'm wondering if I do something like $_SERVER['myVar'] = "myValue", does it change in other sessions? Could I access that custom variable from other sessions?
Can PHP superglobals be changed or appended with another variable?
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No.
PHP doesn't provide a location to store information that should be shared between multiple visitors to a website. (It has
$_SESSIONfor data that should be shared between multiple requests from the same visitor).The usual way to share data between users is to use a database. A file on the filesystem is another option, but databases solve a lot of problems (race conditions, locking, etc) for you.