如何将这个多维php数组打印到json对象中？

Question

我有一个多维php数组，我试图以json格式打印出来

这是数组

Array ( [0] => Array ( [name] => Zeninjor Enwemeka [title] => At Boston Forum, Federal And Local Officials Discuss Region�s Transportation Future [published] => 2015-10-14 12:22:00 ) [1] => Array ( [name] => Zeninjor Enwemeka [title] => Boston�s Transportation Future? City Releases Report Detailing Public�s Transit Goals [published] => 2015-10-09 09:17:00 ) [2] => Array ( [name] => Ryan caron King [title] => Sen. Murphy Seeks Feedback From �Fed Up� Car Commuters [published] => 2015-10-15 16:25:00 ) [3] => Array ( [name] => patrick skahill [title] => Solar Installations Skyrocket, But Connecticut Consumers Still Need to Do Their Homework [published] => 2015-10-15 09:12:00 ) )

我试过这个但是没有用：

print_r($output_result);
$output = array();
foreach($output_result as $v) {
    $output[key($v)] = current($v);
}
echo json_encode($output);