How can I unset an array's children values in PHP?

Question

I have a structure identical to:

$sidebar_data= [
    'wp_inactive_widgets' => array(),
    'sidebar-1' => array(
        'this' => 'that',
        'this' => 'that',
        'this' => 'that'
    ),
    'sidebar-2' => array(
        'this' => 'that',
        'this' => 'that',
        'this' => 'that',
        'this' => 'that'
    ),
    'array_version' => 3
];

I'm looking to wipe out any values within the array's keys , not just the full array with unset , so, sidebar-1, sidebar-2 should be emptied, but kept, to get the desired result:

$new_sidebar_data = [
    'wp_inactive_widgets' => array(),
    'sidebar-1' => array(),
    'sidebar-2' => array(),
    'array_version' => 3
];

How can I achieve this?

Edit:

I already went through this solution:

$sidebar_data= [
    'wp_inactive_widgets' => array(),
    'sidebar-1' => array(
        'this' => 'that',
        'this' => 'that',
        'this' => 'that'
    ),
    'sidebar-2' => array(
        'this' => 'that',
        'this' => 'that',
        'this' => 'that',
        'this' => 'that'
    ),
    'array_version' => 3
];
$sidebars_widgets_original_keys = array_keys( $sidebar_data);
$sidebars_widgets_new_structure = [];

foreach( $sidebars_widgets_original_keys as $sidebars_widgets_original_key ) {
    $sidebars_widgets_new_structure[$sidebars_widgets_original_key] = array();
}

It works, but it's really ugly and feels counterintuitive to present to anyone.

Answer 1

You can reassign empty array

$new_sidebar_data['sidebar-1'] = [];
$new_sidebar_data['sidebar-2'] = [];

more dynamic way

foreach($new_sidebar_data as &$value) {
    if (is_array($value) && count($value) > 0) {
         $value = [];
    }
}

Answer 2

Another option for you

array_walk($new_sidebar_data, function (&$value, $key) {
    if (is_array($value) && count($value) > 0) {
        $value = [];
    }
});

Works for all keys starting with "sidebar-"