What is the method to get the day of the week for a specified date in php

The way PHP gets the day of the week for a specified date is to use the date function to get it, such as [date("w",$strap);]. The date function can format a timestamp into a more readable date and time.

Related function introduction:

PHP date() function can format the timestamp into a more readable date and time.

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Grammar:

string date ( string $format [, int $timestamp ] )

Parameters:

format Required. Specifies the format of the timestamp.

timestamp Optional. Specify timestamp. The default is the current date and time.

The first required parameter format of the date() function specifies how to format the date/time.

Here are some available characters:

d - represents the day of the month (01 - 31)

m - represents the month (01 - 12)

Y - represents the year (four digits)

w The day of the week, represented by numbers

Code example:

<?php
  header("Content-type: text/html; charset=utf-8");
  //获取星期方法
  function get_week($date){
    //强制转换日期格式
    $date_str=date(&#39;Y-m-d&#39;,strtotime($date));
    //封装成数组
    $arr=explode("-", $date_str);
    //参数赋值
    //年
    $year=$arr[0];
    //月，输出2位整型，不够2位右对齐
    $month=sprintf(&#39;%02d&#39;,$arr[1]);
    //日，输出2位整型，不够2位右对齐
    $day=sprintf(&#39;%02d&#39;,$arr[2]);
    //时分秒默认赋值为0；
    $hour = $minute = $second = 0;
    //转换成时间戳
    $strap = mktime($hour,$minute,$second,$month,$day,$year);
    //获取数字型星期几
    $number_wk=date("w",$strap);
    //自定义星期数组
    $weekArr=array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
    //获取数字对应的星期
    return $weekArr[$number_wk];
  }
  //测试
  $date="2016-08-20";
  echo get_week($date);
  //星期六
?>

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