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  From: Alan Kennington <akenning@dog.topology.org>
  To  : Carlo <carlo@active-ideas.com.au>
  Date: Fri, 23 Jun 2000 12:19:20 +0930

Re: PHP3 bug (apparently)

On Fri, Jun 23, 2000 at 11:15:08AM +1030, Carlo wrote:
> 
> I have used arrays in functions with no problems (not that I have
> noticed).
> 
> Why dont you post your code, mabey we can copywri.. uh .. umm... I mean
> see if anything is wrong.

Source in mailing lists is never popular.
Not with me anyway.
But I'll append an example.

Cheers,
Alan Kennington.

x1.php3
==================================================================
<?php
// wwwe/x1.php3   23 June 2000   Alan Kennington.

// These tables don't seem to be accessible from within functions!
$month_offset0 = array(
    0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
    );
$month_offset1 = array(
    0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335
    );

// Find the position of a day within a financial year.
// This function doesn't seem to be able to access global array elements.
function fy_doy($year, $month, $day, &$fy, &$fy_length, &$doy, &$doy_left) {
    $month1 = $month - 1;
    if ($month1 <= 5) {
        $fy = $year;
        if (($year % 4) == 0) {
            // Leap year.
            $fy_length = 366;
            $doy = $month_offset1[$month1] + $day + 184;
            $mo = $month_offset1[$month1];
            }
        else {
            // Non-leap year.
            $fy_length = 365;
            $doy = $month_offset0[$month1] + $day + 184;
            $mo = $month_offset0[$month1];
            }
        $doy_left = $fy_length - $doy;
        }
    else {
        $fy = $year + 1;
        $doy = $month_offset0[$month1] + $day - 181;
        $mo = $month_offset0[$month1];
        // If next year is leap...
        if (($fy % 4) == 0)
            $fy_length = 366;
        else
            $fy_length = 365;
        $doy_left = $fy_length - $doy;
        }
    echo("<br>mo = $mo, y = $year, m = $month, d = $day, f = $fy, l = $fy_length, d = $doy, l = $doy_left\n");
    }
echo("<html<head><title>x1</title></head><body>");
fy_doy(2000, 7, 1, $fy, $fy_length, $doy, $doy_left);

echo("<br>fy = $fy<br>fy_length = $fy_length
<br>doy = $doy<br>doy_left = $doy_left</body></html>");
?>
==================================================================

The output to my browser looks like this:

------------------------------------------------------------------
mo = , y = 2000, m = 7, d = 1, f = 2001, l = 365, d = -180, l = 545 
fy = 2001
fy_length = 365 
doy = -180
doy_left = 545
------------------------------------------------------------------

The array access is clearly undefined.
The PHP version is php-3.0.15, and the server 
version is Apache/1.3.12.
OS (irrelevant) is 2.0.36 kernel with RH 5.2.

++++++++++++++++++++++++++++++++++++++++++++++
PS. I admit that the php3 demo program is not minimal.

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