[dev] missuse of negative keys in arrays or PHP bug?

[Vilius Šumskas]

Hello,

Today I noticed that you I can't create top level forums in Agora. After debugging I found that top level in Agora is represented with constant -1.

It seems that PHP doesn't understand negative keys correctly.

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Proof of concept 1:
------------------------

$array = array('-1' => 'negative', '1' => 'positive');

echo '1: ' . $array[-1] . '<br>';
echo '2: ' . $array['-1'] . '<br>';

echo '3: ' . $array[1] . '<br>';
echo '4: ' . $array['1'] . '<br>';

------------------------
Result 1:
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Notice: Undefined offset: -1 in /var/www/html/test.php on line 5
1: 
2: negative
3: positive
4: positive

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Proof of concept 2:
------------------------

$array = array(-1 => 'negative', '1' => 'positive');

echo '1: ' . $array[-1] . '<br>';
echo '2: ' . $array['-1'] . '<br>';

echo '3: ' . $array[1] . '<br>';
echo '4: ' . $array['1'] . '<br>';

------------------------
Result 2:
------------------------

1: negative

Notice: Undefined index: -1 in /var/www/html/test.php on line 6
2: 
3: positive
4: positive

Is this PHP bug?

-- 
  Pagarbiai,

  Vilius Šumskas
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