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Вопрос по циклу for


antonP
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Читаю книгу по пхп. И возник вопрос по примеру.

Почему данный цикл выводит не 100 точек в конце?

<?php 
for ($i=0, $j=0, $k="Points"; $i<100; $j++, $i+=$j) $k = $k.".";
echo $k;
?>

Сто точек это было бы так:

<?php for ($i=0, $k="Points"; $i<100; $i++) {$k = $k.".";} echo $k; ?>

А у вас всего 15 точек потому что i принимает значения

0 1 3 6 10 15 21 28 36 45 55 66 78 91 105

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