Beautiful Days at the Movies

https://www.hackerrank.com/challenges/beautiful-days-at-the-movies/problem

<?php

// Complete the beautifulDays function below.
function beautifulDays($i, $j, $k) {
    $result = 0;
    for($i; $i<=$j;$i++){
        $num1 = (string)$i;
        $num2 = strrev($num1);

        $chk = (abs((int)$num1 - (int)$num2)) % $k;
        if(!$chk){
            $result++;
        }
    }
    return $result;
}

$fptr = fopen(getenv("OUTPUT_PATH"), "w");

$stdin = fopen("php://stdin", "r");

fscanf($stdin, "%[^\n]", $ijk_temp);
$ijk = explode(' ', $ijk_temp);

$i = intval($ijk[0]);

$j = intval($ijk[1]);

$k = intval($ijk[2]);

$result = beautifulDays($i, $j, $k);

fwrite($fptr, $result . "\n");

fclose($stdin);
fclose($fptr);

솔직히 문제가 넘 쉬워서 그런가. 영어도 쉬웠다. 번역기 한번 돌렸긴 하지만…