for循环正在遍历$data_statuses数组，我希望它输出epBwfEntry_update_submitted_epBwfNotify索引的值，因为它存在于$data中（复制了下面的数组结构）。我循环遍历该数组，并在使用$data_statuses数组找到匹配项后停止。
$data_statuses = array(
'epBwfEntry_update_draft' => 'draft',
'epBwfEntry_create_draft' => 'draft',
'epBwfEntry_update_draft' => 'draft',
'epBwfEntry_update_submitted_epBwfNotify' => 'pending',
'epBwfEntry_create_submitted_epBwfNotify' => 'pending',
'epBwfDraft_create_submitted_epBwfNotify' => 'pending',
'epBwfDraft_update_submitted_epBwfNotify' => 'pending',
);
foreach($data_statuses as $key => $value)
{
if (in_array($key, $data))
{
print 'data: ' . $key . ': ' . $value . ' => ' . $data[$key];
break;
}
}
// index epBwfEntry_update_submitted_epBwfNotify exists in the $data array
// outputs: data: epBwfEntry_update_draft: draft =>
// expected output: epBwfEntry_update_submitted_epBwfNotify: pending => submitted
// $data array
Array
(
[entry_id] => 3356
[channel_id] => 1
[autosave_entry_id] => 0
[field_id_113] => YToxOntzOjE3OiJ0cmlnZ2VyX3JldmlzaW9ucyI7czoxOiIxIjt9
[field_id_28] =>
[field_id_103] =>
[field_id_1] =>
[field_id_79] => Yes
[field_id_2] =>
[field_id_3] =>
[new_channel] => 1
[epBwfEntry_update_submitted_epBwfNotify] => submitted
[schedule_date_status] => no
[draft_publish_date] => 01/19/2016
[cp_call] => 1
[revision_post] => Array
(
[entry_id] => 3356
[channel_id] => 1
[autosave_entry_id] => 0
[filter] =>
[structure__parent_id] => 2927
[structure__template_id] => 146
[structure__hidden] => n
[title] => testtttt
[structure__uri] => testtttt
[url_title] => testtttt
[expiration_date] =>
[structure__listing_channel] => 0
[field_id_113] => Array
(
[trigger_revisions] => 1
)
[field_id_28] => Array
(
[0] =>
)
[field_id_103] =>
[field_id_1] =>
[field_id_79] => Yes
[field_id_2] =>
[field_id_3] =>
[entry_date] => 1452194340
[new_channel] => 1
[author] => 112
[versioning_enabled] => y
[epBwfEntry_update_submitted_epBwfNotify] => submitted
[schedule_date_status] => no
[draft_publish_date] => 01/19/2016
)
[options] =>
[author] =>
)
in_array检查要搜索的数组中是否存在值。您不是在搜索值，而是在搜索密钥，因此您需要（例如…）：
if (array_key_exists($key, $data)) {
...
注意，这不会在数组中的值中搜索关键字，这些值本身就是数组，但这同样适用于in_array；两者都只搜索数组的第一级。