trampoline.php

trampoline.php

<?php
// JavaScript・再帰・トランポリン - Qiita
// https://qiita.com/41semicolon/items/985bdd2f551d9392463c

function countDown($num) {
  if ($num == 1) return 1;
  if ($num%10000 == 0) echo $num."\n";
  return countDown($num-1);
}
//countDown(650000);

function countDown2($num) {
  if ($num == 1) return 1;
  if ($num%10000 == 0) echo $num."\n";
  return function() use($num) {
      return countDown2($num-1);
  };
}

function trampoline($fn) {
    return function(...$args) use($fn) {
        $result = $fn(...$args);
        while ($result instanceof \Closure) {
            $result = $result();
        }
        return $result;
    };
}


$tramped = trampoline('countDown2');
echo $tramped(650000);