Description:
------------
I use preg_replace_callback to substitute parts of an expression with either true or false after which the expression can be evaluated using eval:

_q1,1,1-2 & _q2,3-4,7
should become
true & false
which can be evaluated to false.

The strings represent answers to questions (it's for an interview system)

The problem is that the answers are stored in a global array. The (global) array can not be read from a function that is called from preg_replace_callback

It would be nice if somebody can fix this :-)

Reproduce code:
---------------
function parseqstring($qstring)
{    
    global $qre;
    preg_match_all('/(\d+-\d+|\d+)/', $qstring, $numbers);
    $q = array_shift($numbers[0]);
    foreach($numbers[0] as $number)
    {
        //if its a number check the answer
        if(is_numeric($number))
        {
            //if the answer is there return true because it's all 'or' conditions
            if($qre[$q]['answers'][$number]==1)
            {
                return 'true';
            }
        }
        //if its a range check all the numbers in the range
        if(preg_match('/(\d+)-(\d+)/', $number, $match))
        {
            for($i=$match[1];$i<=$match[2];$i++)
            {
                if($qre[$q]['answers'][$i])
                {
                    return 'true';
                }
            }
        }
    }
    return 'false';
}




Expected result:
----------------
input: 
$qstring = _q1,1,3-4
$qre[1]['answers'][3]
output:
'true'

Actual result:
--------------
'false'