Description:
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If I save a variable to $_SESSION, for example $_SESSION['varname'] = 'value', and then assign a value to a normal variable of the same name, $varname = 'value2', then the value of the session variable is overwritten with the second value.

This is not an issue of assignment by reference -- I assign values, as shown in the code I have provided.

The first time the code is executed, the results are correct on my machine.  However, on subsequent executions of the code, the results become incorrect.

Reproduce code:
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<?PHP

session_start();

$_SESSION['var'] = 'Foo';
print 'Session.var = '.$_SESSION['var'].'<BR>';

$var = 'Bar';
print 'var = '.$var.'<BR>';

$var1 = $_SESSION['var'];
print 'var1 = '.$var1.'<BR>';


?>

Expected result:
----------------
Session.var = Foo
var = Bar
var1 = Foo

Actual result:
--------------
Session.var = Foo
var = Bar
var1 = Bar