<?php
 
$total = 7;
$skip = 4;
 
//создаем массив для хранения участников
$humans = array();
 
//заполняем массив участниками жеребьевки
for ($i = 0; $i < $total; $i++) {
    $humans[$i] = $i + 1;
}
 
function oneDraw($humans, $skip) {
//находим сколько участников не вошло в жеребьевку,
//с этой части будет начинаться новый тур жеребьевки
    $humansEnd = count($humans) % $skip;
 
    echo "======================== \n";
    echo "на входе: \n";
    var_dump($humans);
 
//удаляем проигравших
    $length = count($humans);
    for ($i = 0, $j = 0; $i < $length; $i++) {
        $j++;
        if ($j == $skip) {
            unset($humans[$i]);
            $j = 0;
        }
    }
 
    echo "после удаления: \n";
    var_dump($humans);
 
//переносим людей в начало массива, жеребьевка будем начинать с них;
    while ($humansEnd > 0) {
        array_unshift($humans, array_pop($humans));
        $humansEnd--;
    }
 
    echo "на выходе: \n";
    var_dump($humans);
    echo "======================== \n";
    echo "\n";
    return array_values($humans);
}
 
function multiDrow($oneDrow, $skip) {
    $countDrow = count($oneDrow);
    if ($countDrow < $skip) {
        return $oneDrow;
    } else {
        return multiDrow(oneDraw($oneDrow, $skip), $skip);
    }
}
 
$result = multiDrow(oneDraw($humans, $skip), $skip);
 
echo "Выигрышные места: ";
 
foreach ($result as $value) {
    echo "{$value} ";
}
 
//$draw1 = oneDraw($humans, $skip);
//$draw2 = oneDraw($draw1, $skip);
//$draw3 = oneDraw($draw2, $skip);
//$draw4 = oneDraw($draw3, $skip);
//
//foreach ($draw1 as $human) {
//    echo "{$human} ";
//}
//
//echo "\n";
//
//foreach ($draw2 as $human1) {
//    echo "{$human1} ";
//}
//
//echo "\n";
//
//foreach ($draw3 as $human2) {
//    echo "{$human2} ";
//}
//
//echo "\n";
//
//foreach ($draw4 as $human2) {
//    echo "{$human2} ";
//}

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