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Инкремент имени переменной


Coder_D
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Ребята, привет.

Никак не могу сообразить, не хватает знаний.

Мне нужно каждые 40 проходов цикла записывать в новый массив

(неизвестно сколько проходов будет).
 

$i = 1;
$j = 1;
$cat = "cat";
foreach($xmlres->categories->category as $category)
{
    if($i <= 40)
    {
        $cat.$j[] = $category->id;
        $i++;
    }
    else
    {
        $i = 1;
        $j++;
    }
}

Не получает. Помогите!

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