Description:
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$_SESSION variables are sometimes overwritten on FreeBSD


Reproduce code:
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	session_start();

	print_r($_SESSION);
	
	$kdnr = 1;
	if (isset($_SESSION['kdnr']))
		$kdnr = $_SESSION['kdnr'];
	
	print_r($_SESSION);

the variable $_SESSION['kdnr'] was set in an other script to "123"



Expected result:
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Output under Windows with IIS

Array ( [kdnr] => 123 ) Array ( [kdnr] => 123 ) 

OK.

on the server of my provider there is FreeBSD running
the output looks like this:

Array ( [kdnr] => 123 ) Array ( [kdnr] => 1 ) 

so the $kdnr = 1 line has overwritten the session variable!