foreach loop in a foreach loop

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I would do something like that:

PHP Code:

$data['categories'] = $this->books_model->get_categories();

foreach ($data['categories'] as &$cat) {
    $cat['books'] = $this->books_model->get_books($cat['id']);
} 


In the view you can loop like that:

PHP Code:

foreach ($categories as $cat) {
    echo $cat['name'] . "<br>";

    foreach ($cat['books'] as $book) {
        echo $book['title']. "<br>";
    }
} 


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