Description:
------------
On PHP 7.0.4 the args in debug_backtrace() do not give the correct arguments at the time of the call.

Test script:
---------------
<?php
function foo($var) {
  array_shift($var);
  var_dump(debug_backtrace());
}
$bar = ['a'];
foo($bar);

Expected result:
----------------
array(1) {
  [0]=>
  array(4) {
    ["file"]=>
    string(11) "test.php"
    ["line"]=>
    int(8)
    ["function"]=>
    string(3) "foo"
    ["args"]=>
    array(1) {
      [0]=>
      array(0) {
        [0]=>
        string(1) "a"
      }
    }
  }
}

Actual result:
--------------
array(1) {
  [0]=>
  array(4) {
    ["file"]=>
    string(11) "C:\test.php"
    ["line"]=>
    int(8)
    ["function"]=>
    string(3) "foo"
    ["args"]=>
    array(1) {
      [0]=>
      &array(0) {
      }
    }
  }
}