使用表格构建层次结构 - PHP

Question

我遇到以下情况有困难，我有一个包含类别的数组，因此类别可以有子类别，子类别可以无限地拥有子类别。现在我想要实现的目标如下，但我无法实现这一目标。

我在以下结构中有一个数组$items

Array
(
    [0] => Array
        (
            [label] => Main Cat
            [id] => 29
            [parent_id] => 19
        )

    [1] => Array
        (
            [label] => Main Cat
            [id] => 17
            [parent_id] => 19
        )

    [2] => Array
        (
            [label] => Main Cat
            [id] => 20
            [parent_id] => 19
            [items] => Array
                (
                    [0] => Array
                        (
                            [label] => Child Level 1
                            [id] => 21
                            [parent_id] => 20
                        )

                    [1] => Array
                        (
                            [label] => Child Level 1
                            [id] => 22
                            [parent_id] => 20
                            [items] => Array
                                (
                                    [0] => Array
                                        (
                                            [label] => Child Level 2
                                            [id] => 27
                                            [parent_id] => 22
                                            [items] => Array
                                                (
                                                    [0] => Array
                                                        (
                                                            [label] => Child Level 3
                                                            [id] => 28
                                                            [parent_id] => 27
                                                        )

                                                )

                                        )

                                )

                        )

                    [2] => Array
                        (
                            [label] => Child Level 1
                            [id] => 23
                            [parent_id] => 20
                        )

                    [3] => Array
                        (
                            [label] => Child Level 1
                            [id] => 24
                            [parent_id] => 20
                            [items] => Array
                                (
                                    [0] => Array
                                        (
                                            [label] => Child Level 2
                                            [id] => 25
                                            [parent_id] => 24
                                        )

                                    [1] => Array
                                        (
                                            [label] => Child Level 2
                                            [id] => 26
                                            [parent_id] => 24
                                        )

                                )

                        )

                )

        )

)

现在我希望以下数组显示在每个子级别缩进的表格中，如果它应该从子级别3升级到子级别2，则应该再次反转。

实施例

<table border="2" width="100%">
    <tr>
        <td>Main Cat</td>
    </tr>
    <tr>
        <td>Main Cat</td>
    </tr>
    <tr>
        <td>Main Cat</td>
    </tr>
    <tr>
        <td style="margin-left:20px;">Child Level 1</td>
    </tr>
    <tr>
        <td style="margin-left:20px;">Child Level 1</td>
    </tr>
    <tr>
        <td style="margin-left:40px;">Child Level 2</td>
    </tr>
    <tr>
        <td style="margin-left:60px;">Child Level 3</td>
    </tr>
    <tr>
        <td style="margin-left:20px;">Child Level 1</td>
    </tr>
    <tr>
        <td style="margin-left:20px;">Child Level 1</td>
    </tr>
    <tr>
        <td style="margin-left:40px;">Child Level 2</td>
    </tr>
    <tr>
        <td style="margin-left:40px;">Child Level 2</td>
    </tr>
</table>

到目前为止，我的PHP代码看起来像这样，

public function renderCategoriesRecursive($items)
        {
                foreach($items as $item)
                {

                        $itemCount = count($item['items']);



                        echo CHtml::openTag('tr');
                            echo CHtml::openTag('td',array('class'=>$class));
                                echo $item['label'];
                            echo CHtml::closeTag('tr');
                        echo CHtml::closeTag('tr');


                        if(isset($item['items']) && $itemCount)
                        {

                                $this->renderCategoriesRecursive($item['items']);

                        }
                }
}

变量 $ items 包含上面的数组

Answer 1

我注意到你自己的解决方案引用了变量$ class，所以我也把它合并了。你真的不需要使用CHtml（除非你这样做，但我从未见过这样的情况）

function renderItems( $array, $class, $indent = 0  ) {

    foreach( $items as $item) {
        echo '<tr><td class="'.$class.'">'.$item['label'].'</td></tr>';

        if( isset( $item['items'] && count( $item['items'] )
            renderItems($item['items'],$class,$indent+1);
    }

}