php约瑟夫环

<?php 

function popChar($str , $m , $current = 0){

    $number = count($str);

    $num = 1;

    if(count($str) == 1){

        echo $str[0];

        return;

    }

    else{

        while($num++ < $m){

            $current++ ;

            $current = $current%$number;

        }

        echo $str[$current]."<br/>";

        array_splice($str , $current , 1);

        popChar($str , $m , $current);

    }

}

//$str = array(1 , 2 , 3 , 4 , 5 , 6 , 7, 8 , 9 , 10);  

$str = array('a','b','c','d','e','f','g','h');  

$m = 4; 

popChar($str , $m);

?>