Description:
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If you assign $_SESSION to variable you can't register more data after assignment and it differs even on kind of a variable local or static. If you place assignments between registering data, you can't: 1) to a static varable ex.: self::$var you can't register data after that assignments, 2) to local variable $var=$_SESSION you can't register data before and after. But there is workaround you should assign with casting to array: $var = (array)$_SESSION in both cases.


Reproduce code:
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// 1 - seperate code
$_SESSION["test1"] = "test1";
self::$var = $_SESSION;
$_SESSION["test2"] = "test2";
// 2 - seperate code
$_SESSION["test1"] = "test1...";
$var = $_SESSION;
$_SESSION["test2"] = "test2...";
//workaround
$_SESSION["test1"] = "test1...";
$var = (array)$_SESSION;
self::$var = (array)$_SESSION;
$_SESSION["test2"] = "test2...";

Expected result:
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I expect register data to $_SESSION after assignments $_SESSION to some variable.

Actual result:
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It's not