Description:
------------
$_SESSION['key'] (key) is changing when using $key in context.

Seems only happening on Mac OSX, because the "expected result" (below) comes from linux php, the "actual result" comes out of a Mac machine.

Reproduce code:
---------------
<?php
session_start();
class test{
	public function get_data(){
		$tmp = array(
				array('isadmin'=>1, 'test'=>0)	
			);
		$_SESSION['user'] = $tmp[0];
	}
}

$tester = new test();
$tester->get_data();
var_dump($_SESSION);
/*
 * Output (correct):
  array(1) {
  ["user"]=>
  &array(2) {
    ["isadmin"]=>
    int(1)
    ["test"]=>
    int(0)
  }
}
  
 */
$user = array('isadmin'=>0, "test"=>1);
var_dump($_SESSION);

/*
 * Output (NOT correct):
 * 
array(1) {
  ["user"]=>
  &array(2) {
    ["isadmin"]=>
    int(0)
    ["test"]=>
    int(1)
  }
}
 */
?>

Expected result:
----------------
array(1) {
  ["user"]=>
  array(2) {
    ["isadmin"]=>
    int(1)
    ["test"]=>
    int(0)
  }
}
array(1) {
  ["user"]=>
  array(2) {
    ["isadmin"]=>
    int(1)
    ["test"]=>
    int(0)
  }
}


Actual result:
--------------
array(1) {
  ["user"]=>
  &array(2) {
    ["isadmin"]=>
    int(1)
    ["test"]=>
    int(0)
  }
}
array(1) {
  ["user"]=>
  &array(2) {
    ["admin"]=>
    int(0)
    ["test"]=>
    int(1)
  }
}