$array = array(\Carbon\Carbon::parse('2017-04-11 00:00:00'), \Carbon\Carbon::parse('2017-04-12 00:00:00'),\Carbon\Carbon::parse('2017-04-13 00:00:00'),\Carbon\Carbon::parse('2017-04-14 00:00:00'),\Carbon\Carbon::parse('2017-04-15 00:00:00'));

foreach($array as $key =>$arr){
    //var_dump('key:'. $key);
    //echo "";
    echo $arr->dayOfWeek;
    echo "<br>";
}

die;