php从多维数组中获取最多和最少的值

I want to get most and least occuring values from php sequential/indexes, assoc and multidimensional arrays

Consider the following dataSet

        $dataSet = [
            'users' => 
            [
                'id' => 1,
                'name' => "Alex",
                'username' => 'alex',
            ],
            [
                'id' => 2,
                'name' => "Alex",
                'username' => 'alex'
            ],
            [
                'id' => 2,
                'name' => "Peter Khot",
                'username' => 'peter',
            ]
        ];

Here above are samples dataSet

Here is what that i tried

    function most_occurring(array $array, $key)
    {
        $dataSet = [];
        $i = 0;
        $keys = [];
        foreach ($array as $k) {
            if (in_array($k[$key], $keys)) {
                $keys[$i] = $k[$key];
                $dataSet[$i] = $k;
            } 

            $i++;
        }

        return $dataSet;
    }

I tried above code for most occurring values but not working at all, help me in most and least occuring values from arrays. Thanks