使用Laravel获取父级和子级数据

Question

I am using Laravel 5.7 and I want to show child data using parent id.

I created a CategoryController and I am fetching the data by parent id shown here. However, I want to show all the data in the index page.

<?php

$parentCat = Category::where('parent', 0)->get();
foreach ($parentCat as $parent) {
    echo "<pre>";
    echo $parent->category_name;
    $category = Category::where('parent', $parent->id)->get();

    foreach ($category as $child) {
        echo "<pre>";
        echo $child->category_name;
    }

}

return view('fnf.category.index')->with('parent', $parentCat);

<table class="table table-striped">
    <tr>
        <th>Man</th>
        <th><a href=""> Edit</a></th>
    </tr>
    <tr>
        <td>Shirt</td>
        <td><a href=""> Edit</a></td>
    </tr>
    <tr>
        <td>Shirt</td>
        <td><a href=""> Edit</a></td>
    </tr>
    <tr>
        <th>Woman</th>
        <th><a href=""> Edit</a></th>
    </tr>
    <tr>
        <td>Woman Shirt</td>
        <td><a href=""> Edit</a></td>
    </tr>
</table>