date_default_timezone_set('Asia/Shanghai');
>
<head>
<title>欢迎来到主页</title>
</head>
<body>
<h1
align="center">我的主页</h1>
当前时间：<php echo(date('Y-m-d H:i:s'));><br>
星期<php echo(date('N'));>
<p
align="center">欢迎大家访问我的网站，希望大家给我提出更多的意见。
</body>
</html>PHP计算一年多少个星期和每周的开始和结束日期方法如下：
方法一：
<php
header("Content-type:text/html;charset=utf-8");
date_default_timezone_set("Asia/Shanghai");
$year = (int)$_GET['year'];
$week = (int)$_GET['week'];
$weeks = date("W", mktime(0, 0, 0, 12, 28, $year));
echo $year '年一共有' $weeks '周<br />';
if ($week > $weeks || $week <= 0)
{
$week = 1;
}
if ($week < 10)
{
$week = '0' $week;
}
$timestamp['start'] = strtotime($year 'W' $week);
$timestamp['end'] = strtotime('+1 week -1 day', $timestamp['start']);
echo $year '年第' $week '周开始时间戳：' $timestamp['start'] '<br />';
echo $year '年第' $week '周结束时间戳：' $timestamp['end'] '<br />';
echo $year '年第' $week '周开始日期：' date("Y-m-d", $timestamp['start']) '<br />';
echo $year '年第' $week '周结束日期：' date("Y-m-d", $timestamp['end']);
>
方法二： <php
header("Content-type:text/html;charset=utf-8");
function getIsoWeeksInYear($year)
{
$date = new DateTime;
$date->setISODate($year, 53);
return ($date->format("W") === "53" 53 : 52);
}
function weekday($custom_date)
{
$week_start = date('d-m-Y', strtotime('this week monday', $custom_date));
$week_end = date('d-m-Y', strtotime('this week sunday', $custom_date));
$week_array[0] = $week_start;
$week_array[1] = $week_end;
return $week_array;
}
echo '<br> Weeks in 2013<br>' getIsoWeeksInYear(2013);
$weekday = weekday(strtotime(date('d-m-Y', strtotime('5-8-2013'))));
echo '<br> 10-8-2013';
echo '<br>Start: ' $weekday[0];
echo '<br>End: ' $weekday[1];
>
或者方法三：
function get_week($year) {
$year_start = $year "-01-01";
$year_end = $year "-12-31";
$startday = strtotime($year_start);
if (intval(date('N', $startday)) != '1') {
$startday = strtotime("next monday", strtotime($year_start)); //获取年第一周的日期
}
$year_mondy = date("Y-m-d", $startday); //获取年第一周的日期
$endday = strtotime($year_end);
if (intval(date('W', $endday)) == '7') {
$endday = strtotime("last sunday", strtotime($year_end));
}
$num = intval(date('W', $endday));
for ($i = 1; $i <= $num; $i++) {
$j = $i -1;
$start_date = date("Y-m-d", strtotime("$year_mondy $j week "));
$end_day = date("Y-m-d", strtotime("$start_date +6 day"));
$week_array[$i] = array (
str_replace("-",
"",
$start_date
), str_replace("-", "", $end_day));
}
return $week_array;
}
函数get_week()通过传入参数$year年份，获取当年第一天和最后一天所在的周数，计算第一周的日期，通过循环获取每一周的第一天和最后一天的日期。最后返回是一个数组。
想得到指定周数的开始日期和结束日期，比如2011年第18周的开始日期和结束日期，代码如下：
复制代码 代码如下:
$weeks = get_week(2011);
echo '第18周开始日期：'$weeks[18][0]'';
echo '第18周结束日期：'$weeks[18][1];
最后输出结果：
第18周开始日期：20110502
第18周结束日期：20110508
欢迎分享，转载请注明来源：内存溢出
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