stack4lookback.phpphp

<?php

//stack is for LookBack (2018-10-22)
$d=range(1,10);


function p($d) {return print_r($d);}



p($d);

 
 

$ret = 
array_reduce(
    $d,

    function($s,$e){
 

        $top = array_pop($s);//look back
       // $s[]=$top;
       $s[]=$top+$e;
  
        return $s;
    },
    [0]
);

 p($ret);