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<?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);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'task.discriminator', 1 => 'status.deleted', )

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