JavaScript를 사용하지 않고 HTML 양식에서 배열을 게시하려면 어떻게 해야 합니까?

<input type="text" name="firstname">
<input type="text" name="lastname">
<input type="text" name="email">
<input type="text" name="address">

<input type="text" name="tree[tree1][fruit]">
<input type="text" name="tree[tree1][height]">

<input type="text" name="tree[tree2][fruit]">
<input type="text" name="tree[tree2][height]">

<input type="text" name="tree[tree3][fruit]">
<input type="text" name="tree[tree3][height]">

$_POST[] = array(
    'firstname' => 'value',
    'lastname' => 'value',
    'email' => 'value',
    'address' => 'value',
    'tree' => array(
        'tree1' => array(
            'fruit' => 'value',
            'height' => 'value'
        ),
        'tree2' => array(
            'fruit' => 'value',
            'height' => 'value'
        ),
        'tree3' => array(
            'fruit' => 'value',
            'height' => 'value'
        )
    )
);