HackerRank: Day of Programmer; PHP algorithm

dayOfProgrammer.php

<?php
function dayOfProgrammer($year) {
    $targetDays = 256;
    $targetCalendar = CAL_GREGORIAN;

    if ($year < 1919){
        $targetCalendar = CAL_JULIAN;
    }

    // In 1918, February 14th was the 32nd day of the year    
    $totalDays = 0;
    $startMonth = ($year == 1918) ? 2 : 1;

    for ($i = $startMonth; $i < 9; $i++){
        $d = cal_days_in_month($targetCalendar, $i, $year);

        if ($i == 2 && $year == 1918){
            $remainingDaysAfterFeb14 = $d - 14;
            $totalDays = (32 + $remainingDaysAfterFeb14);
            continue;
        }

        $totalDays += $d;

    }

    $remainingDays = $targetDays - $totalDays;

    return "$remainingDays.09.$year";
}

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

$year = intval(trim(fgets(STDIN)));

$result = dayOfProgrammer($year);

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

fclose($fptr);