Detailed explanation of PHP week time code

This article mainly shares with you the detailed explanation of PHP weekly time code, hoping to help everyone.

/*
系统自带的date('W',time()） 有bug  比如，一年中的第一天如果不是周一的话，返回值是
52或者53。 可以实测一下。就是说， 系统默认认为这一天是去年的第52/53周。
*/
 
echo get_weeks_num('2017-01-01');
 
function get_weeks_num($time){
        $month = intval(date('m',$time));//当前时间的月份
        $fyear = strtotime(date('Y-01-01',$time));//今年第一天时间戳
        $fdate = intval(date('N',$fyear));//今年第一天 周几
        $sysweek = intval(date('W',$time));//系统时间的第几周
        //大于等于52 且 当前月为1时， 返回1
        if(($sysweek >= 52 && $month == 1)){
            return 1;
        }elseif($fdate == 1){
            //如果今年的第一天是周一,返回系统时间第几周
            return $sysweek;
        }else{
            //返回系统周+1
            return $sysweek + 1;
        }
    }

<?php
    $strTime = &#39;2017-09-14&#39;;
    $intWeek = ceil(((strtotime($strTime) - strtotime("2017-01-01 00:00:00")))/(7*86400));
    var_dump($strTime."是今年的第".$intWeek."周");
 
?>

<?PHP
    getdate();

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