PHP Recursively unset array keys if match

Question

I have the following array that I need to recursively loop through and remove any child arrays that have the key 'fields'. I have tried array filter but I am having trouble getting any of it to work.

$myarray = array(
    'Item' => array(
        'fields' => array('id', 'name'),
        'Part' => array(
            'fields' => array('part_number', 'part_name')
        )
    ),
    'Owner' => array(
        'fields' => array('id', 'name', 'active'),
        'Company' => array(
            'fields' => array('id', 'name',),
            'Locations' => array(
                'fields' => array('id', 'name', 'address', 'zip'),
                'State' => array(
                    'fields' => array('id', 'name')
                )
            )
        )
    )    
);

This is how I need it the result to look like:

$myarray = array(
    'Item' => array(
        'Part' => array(
        )
    ),
    'Owner' => array(
        'Company' => array(
            'Locations' => array(
                'State' => array(
                )
            )
        )
    )    
);

Answer 1

If you want to operate recursively, you need to pass the array as a reference, otherwise you do a lot of unnecessarily copying:

function recursive_unset(&$array, $unwanted_key) {
    unset($array[$unwanted_key]);
    foreach ($array as &$value) {
        if (is_array($value)) {
            recursive_unset($value, $unwanted_key);
        }
    }
}