PHP
(quick beginner's guide)
START SESSION session_start();
SET SESSION DATA $_SESSION["hello"] = "world"; $hello = "world";
START/RESUME SESSION session_start();
OUTPUT echo $_SESSION["hello"]; world echo $hello; gone - undefined
APPEND DATA $_SESSION["name"] = "Jon"; $_SESSION["colors"] = ["R", "G", "B"];
START/RESUME SESSION session_start();
UNSET DATA unset($_SESSION["hello"]);
START/RESUME SESSION session_start();
END SESSION session_destroy(); unset($_SESSION);