<?php
error_reporting(-1);
 
$total = 30;
$skip = 5;
 
$s = range(1, $total);
 
$i = 0;
 
while (count($s) >= $skip) {
    $i++;
    if ($i === $skip - 1) {
 
        $d = array();
 
        unset($s[$i]);
 
        for ($j = 0; $j < count($s) - $skip + 1; $j++) {
            array_push($d, $s[$skip + $j]);
        }
 
        for ($j = 0; $j < $skip - 1; $j++) {
            array_push($d, $s[$j]);
        }
 
        $s = $d;
 
        $i = 0;
 
        unset($d);
    }
 
}
 
sort($s, SORT_NUMERIC);
 
echo("Чай пить остались: " . implode(', ', $s));
 
 
 

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