Online PHP editor | refs for YhEDR

@ 2017-04-12T09:00:16Z

<?php

$arr = ['$and'=> ['task.discriminator' => 'filippo', 'status.deleted' => 'asdf']];

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr));
$keys = array();
foreach ($iterator as $key => $value) {

    $keys[] = $key;
}
var_export($keys);