How to get the day of the week for a specified date in PHP

This article mainly introduces the method of PHP to obtain the day of the week for a specified date, involving PHP's date reading, judgment, and string and array related operation operations skills. Friends in need can refer to the following

The example of this article describes the implementation method of PHP to obtain the day of the week for a specified date. Share it with everyone for your reference, the details are as follows:

<?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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