<?php
// In the beginning there are no Sundays counted yet
$number_of_sundays = 0;
// Make the following actions for all years of the twentieth century
for ($current_year = 1900; $current_year <= 1999; $current_year++) {
//Make the following actions for all months from January to December
for ($current_month = 1; $current_month <= 12; $current_month++) {
// Get Unix Timestamp of the current month and year on the first day of the month
$current_date = mktime(0, 0, 0, $current_month, 01, $current_year);
$get_day_of_week = date("D", $current_date);
if ($get_day_of_week == "Sun") {
echo 01.$current_month.$current_year."was a Sunday!"."\n";
}
}
}