PHP How to remove duplicate value in multidimensional array and merge others

I've spend couple of hours on this problem. I have a multidimension array with fonts details and I want to merge it to send one request to google web fonts. (Each array describe font details of different html tag) Anyone can help me with that?

Input:

Array
(
[1] => Array
    (
        [family] => Abril Fatface
        [weight] => regular
        [charset] => latin,latin-ext
    )

[2] => Array
    (
        [family] => Akronim
        [weight] => regular
        [charset] => latin
    )

[3] => Array
    (
        [family] => Akronim
        [weight] => regular, bold
        [charset] => latin
    )

[4] => Array
    (
        [family] => Akronim
        [weight] => regular
        [charset] => latin, latin-ext
    )

[5] => Array
    (
        [family] => Acme
        [weight] => regular
        [charset] => latin
    )


)

Output:

Array
 [0]   (
        [family] => Abril Fatface
        [weight] => regular
        [charset] => latin,latin-ext

    )

[1] (
        [family] => Akronim
        [weight] => regular, bold
        [charset] => latin,latin-ext

    )
[2] (
        [family] => Acme
        [weight] => regular
        [charset] => latin

    )

Function

function font_merge_unique($col, $arr, $exj)
{
    $test = array();

    foreach($arr AS $key => $row)
    {
        $test[$key] = strtolower(preg_replace('/[^A-Za-z0-9]/', '', $row[$col]));
        foreach($exj AS $index)
        {
            $arr[$key][$index] = array_map('trim', (is_array($arr[$key][$index]) ? $arr[$key][$index] : explode(',', $arr[$key][$index])));
        }
    }

    $unique = array_unique($test);

    $dupes = array_diff_key($test, $unique);

    $list = array();

    foreach($unique AS $key => $n)
    {
        $list[$key] = $arr[$key];
    }

    foreach($dupes AS $di => $row)
    {
        $index = array_search($row, $unique);

        foreach($exj AS $merge)
        {
            $list[$index][$merge] += $arr[$di][$merge];
        }
    }

    foreach($list AS $index => $row)
    {
        foreach($exj AS $merge)
        {
            $list[$index][$merge] = implode(',', $list[$index][$merge]);
        }
    }

    return array_values($list);
}

Usage

• Param 1 (String) Key name of value to make unique.
• Param 2 (Array) To Process.

• Param 3 (Array) List of keys in processed array to make (String|Array) values a unique comma separated String.

  font_merge_unique('family', $array, array('weight','charset'))

Result

Array
(
    [0] => Array
        (
            [family] => Abril Fatface
            [weight] => regular
            [charset] => latin,latin-ext
        )

    [1] => Array
        (
            [family] => Akronim
            [weight] => regular,bold
            [charset] => latin,latin-ext
        )

    [2] => Array
        (
            [family] => Acme
            [weight] => regular
            [charset] => latin
        )

)