尝试在 strtotime PHP 中传递变量时不断遇到"Thu"

Question

我正在尝试解决欧拉项目的第19个问题，但是我遇到了一点麻烦。

问题是:

给你以下信息，但你可能更愿意自己做一些研究。

1 Jan 1900 was a Monday.
Thirty days has September,
April, June and November.
All the rest have thirty-one,
Saving February alone,
Which has twenty-eight, rain or shine.
And on leap years, twenty-nine.
A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.

在二十世纪(1901年1月1日至2000年12月31日)，每个月的第一天有多少个星期日?

下面是我的代码:

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

我甚至还没有试着去数星期天，因为它一遍又一遍地重复Thu。

我在网上搜索，我发现这是因为我试图使用strtotime与一个变量。

那么问题是如何在strtotime或mktime中使用变量?

Answer 1

不知道这里发生了什么。我试过你的剧本，它对我来说是完美的。[PHP 5.4.4-14+deb7u8 (cli) (build: Feb 17 2014 09:18:47)]

运行你的代码与小调整我做了这样的输出:

1900, 1: Mon

1,1,2: Thu

1,1,3: Thu

1990,4: Sun

[more lines]