Description:
------------
The stack trace from an exception shows the wrong value of the parameter that was passed to a function if it's value is changed inside that function (before the exception is thrown).

First bug report, novice PHP developer. Apologies if I miscategorized this report.

Test script:
---------------
<?php
$variable = 'foo';
one($variable);

function one($variable)
{
    try {
        two($variable);
    } catch (Exception $e) {
        echo $e->getTraceAsString();
    }
}

function two($variable)
{
    $variable = 'bar';
    throw new Exception('problem');
}

Expected result:
----------------
Stack trace output:
#0 /file.php(8): two('foo')
#1 /file.php(3): one('foo')
#2 {main}

Actual result:
--------------
Stack trace output:
#0 /file.php(8): two('bar')
#1 /file.php(3): one('foo')
#2 {main}