在PHP中访问多维数组的语法问题

I am having a difficult time getting the syntax correct when trying to access the values in this array. Here is the array and after I will show you what I have tried.

[_POST] => Array
(
    [type] => subscribe
    [fired_at] => 2014-03-11 16:15:11
    [data] => Array
        (
            [id] => a23a8866cd
            [email] => mccoym@sportdirections.com
            [email_type] => html
            [ip_opt] => 65.96.140.144
            [ip_signup] => 65.96.140.144
            [web_id] => 145475077
            [merges] => Array
                (
                    [EMAIL] => mccoym@sportdirections.com
                    [FNAME] => Michael
                    [LNAME] => McCoy
                    [MMERGE3] => 10/17
                )

            [list_id] => e375c4fd87
        )

)

I am trying to get the information stored in the merges array. I have tried:

$_POST['data']->merges['EMAIL']
$_POST['data']->merges->EMAIL
$_POST['data']['merges']->EMAIL

none of the above work! can anyone help me get the syntax correct?

Try:

$_POST['data']['merges']['EMAIL']