get array value by point sperated index

get_var.php

<?php

function get_var($pointed, $arr, $default = '')
{
    $points = explode('.', $pointed);

    $var = $arr;
    $var_name = '';

    while (count($points)) {
        $point = array_shift($points);
        $var_name .= '.' . $point;
//        var_dump('-----------------', $point, $var);
        if (!array_key_exists($point, $var)) {
            if(func_num_args() == 3){
                return $default;
            }
            else {
                throw new \InvalidArgumentException(trim($var_name, '.') . ' not found.');
            }
        }
        $var = $var[$point];
    }
    return $var;
}

var_dump(
    get_var(
        'videos.0.resource.url.location',
        array(
            'videos' => array(
                array(
                    'resource' => array(
                        'url' => array(
                            'location' => 'http://dragonmediagroup.nl'
                        )
                    )
                )
            )
        )
    )
);