$username = 'admin';
$password = 'PASSWORD!';
$routerIp = '192.168.1.1'
$context = stream_context_create(array(
        'http' => array(
            'header'  => "Authorization: Basic " . base64_encode("$username:$password")
        )
    )
);
$data = file_get_contents("http://$routerIp/status-devices.asp", false, $context);
//dhcpd_lease = [ ['Name-Of-Device','192.168.1.100','**:**:**:**:**:52','0 days, 19:37:18'],[ ... ],[ ... ]]

preg_match("/dhcpd_lease =(.+);\n/",$data,$list);

$found = substr(str_replace(array(' ',"'"),'',$list[1]),2,-2);
$results = array();
foreach(explode('],[',$found) as $single){
    $device = explode(',',$single);
    $singleDevice = array();
    $singleDevice['name'] = $device[0];
    $singleDevice['ip'] = $device[1];
    //key is the MAC address
    $results[$device[2]] = $singleDevice;
}
var_dump($results);