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| <?php
function sum($arr, $len) {
if ($len <= 0) {
return 0;
}else{
return $arr[0] + sum(array_slice($arr, 1), $len - 1);
}
}
echo sum(array(1, 2, 3, 4), 4),"\n";
function sum_cps($sum, $arr, $len, $callback) {
if ($len <= 0) {
$callback($sum);
}else{
sum_cps($sum + $arr[0], array_slice($arr, 1), $len - 1, $callback);
}
}
sum_cps(0, array(1, 2, 3, 4), 4, function($value) { echo $value,"\n"; });
?>
|
