Description:
------------
The string, '0', is not handled correctly 
in a foreach loop (and possibly elsewhere).

The first loop executes correctly.  The 
second and third loops perform incorrect
comparisons.  

In loops two and three, '0' == 'NOLIMIT'
evaluates to true when it should be false.


Reproduce code:
---------------
$arr = array('0' => '$0',
             '1000' => '$1,000', 
             '2000' => '$2,000', 
             '3000' => '$3,000', 
             'NOLIMIT' => 'NO LIMIT');
foreach ($arr as $key => $value)
{
    echo "$key : $value $hi\n";
}
echo "\n";
foreach ($arr as $key => $value)
{
    if ($key == 'NOLIMIT') { continue; }
    echo "$key : $value $hi\n";
}
echo "\n";
foreach ($arr as $key => $value)
{
    $hi = ($key == 'NOLIMIT' ? 'hi' : '');
    echo "$key : $value      $hi\n";
}

Expected result:
----------------
0 : $0 
1000 : $1,000 
2000 : $2,000 
3000 : $3,000 
NOLIMIT : NO LIMIT 

0 : $0 
1000 : $1,000 
2000 : $2,000 
3000 : $3,000 

0 : $0
1000 : $1,000      
2000 : $2,000      
3000 : $3,000      
NOLIMIT : NO LIMIT      hi

Actual result:
--------------
0 : $0 
1000 : $1,000 
2000 : $2,000 
3000 : $3,000 
NOLIMIT : NO LIMIT 

1000 : $1,000 
2000 : $2,000 
3000 : $3,000 

0 : $0      hi
1000 : $1,000      
2000 : $2,000      
3000 : $3,000      
NOLIMIT : NO LIMIT      hi

I am using PHP 5.03 and Apache 2.0.53 on Windows XP, service patch 2.