php - How do I get key name on this array loop?

I have 2 keys:

1. content
2. media

I then run this:

$fields = get_post_meta($postId);
unset($fields['_edit_lock'], $fields['_edit_last'], $fields['_thumbnail_id']);
echo '<ul>';
foreach($fields as $i) {
    foreach($i as $key => $value) {
        echo '<li>'.$i.'->'.$value.'</li>';
    }       
}

That gives me:

1. Array-> 327
2. Array-> Custom test 1
3. Array-> Custom test 2

What I'm looking for is:

1. Media-> 327
2. Content-> Custom test 1
3. Content-> Custom test 2

Solution:

Like this:

foreach ((array) get_post_meta($postId) as $arrayKey => $arrayValue) {
    if (!in_array($arrayKey, array("_edit_lock", "_edit_last", "_thumbnail_id"))) {
        foreach ($arrayValue as $key => $value) {
            echo '<li>' . $arrayKey . '->' . $value . '</li>';
        }
    }
}

If you are in a scenario like this:
You have a array like this:

$fields = array(
    'media' => array(
        0 => '327',
    ),
    'content' => array(
        0 => 'Custom test 1',
        1 => 'Custom test 2',
    ),
    'link' => array(
        0 => 'Custom test 10',
        1 => 'Custom test 20',
        2 => 'Custom test 30',
        3 => 'Custom test 40',
    ),
    'embed' => array(
        0 => 'Custom test 100',
        1 => 'Custom test 200',
        2 => 'Custom test 300',
    ),
    '_edit_lock' => array(
        0 => '1667908749:1',
    ),
);

You just want these keys:

media

content

LInk

Embed

I need to output their values in sequence as per this example:

media

content

link

embed

New rows....

media

content

link

embed

You want to get something like this:

media->327
content->Custom test 1
link->Custom test 10
embed->Custom test 100
media->327
content->Custom test 1
link->Custom test 10
embed->Custom test 200
media->327
content->Custom test 1
link->Custom test 10
embed->Custom test 300
media->327
content->Custom test 1
link->Custom test 20
embed->Custom test 100
media->327
content->Custom test 1
link->Custom test 20
embed->Custom test 200
media->327
content->Custom test 1
link->Custom test 20
embed->Custom test 300
media->327
content->Custom test 1
link->Custom test 30
embed->Custom test 100
media->327
content->Custom test 1
link->Custom test 30
embed->Custom test 200
media->327
content->Custom test 1
link->Custom test 30
embed->Custom test 300
media->327
content->Custom test 1
link->Custom test 40
embed->Custom test 100
media->327
content->Custom test 1
link->Custom test 40
embed->Custom test 200
media->327
content->Custom test 1
link->Custom test 40
embed->Custom test 300
media->327
content->Custom test 2
link->Custom test 10
embed->Custom test 100
media->327
content->Custom test 2
link->Custom test 10
embed->Custom test 200
media->327
content->Custom test 2
link->Custom test 10
embed->Custom test 300
media->327
content->Custom test 2
link->Custom test 20
embed->Custom test 100
media->327
content->Custom test 2
link->Custom test 20
embed->Custom test 200
media->327
content->Custom test 2
link->Custom test 20
embed->Custom test 300
media->327
content->Custom test 2
link->Custom test 30
embed->Custom test 100
media->327
content->Custom test 2
link->Custom test 30
embed->Custom test 200
media->327
content->Custom test 2
link->Custom test 30
embed->Custom test 300
media->327
content->Custom test 2
link->Custom test 40
embed->Custom test 100
media->327
content->Custom test 2
link->Custom test 40
embed->Custom test 200
media->327
content->Custom test 2
link->Custom test 40
embed->Custom test 300

So do this:

echo '<ul>';
for ($i = 0; $i < count($fields['media']); $i++) {
    for ($j = 0; $j < count($fields['content']); $j++) {
        for ($k = 0; $k < count($fields['link']); $k++) {
            for ($z = 0; $z < count($fields['embed']); $z++) {
                echo '<li>media->' . $fields['media'][$i] . '</li>';
                echo '<li>content->' . $fields['content'][$j] . '</li>';
                echo '<li>link->' . $fields['link'][$k] . '</li>';
                echo '<li>embed->' . $fields['embed'][$z] . '</li>';
            }
        }
    }
}
echo '</ul>';