Tutorial on how to get the start date and end date of the week of a certain year in PHP

This article explains how to get the start date and end date of the first week of a certain year in PHP.

The example is as follows:

/*

* Get the start date and end date of the first week of a certain year

* @param int $year

* @param int $week;

*/

public function weekday($year,$week=1){
 
$year_start = mktime(0,0,0,1,1,$year);
 
$year_end = mktime(0,0,0,12,31,$year);

// Determine whether the first day is the beginning of the first week

if (intval(date('W',$year_start))===1){
 
$start = $year_start;//把第一天做为第一周的开始
 
}else{
 
$week++;
 
$start = strtotime('+1 monday',$year_start);//把第一个周一作为开始
 
}

// The start time of the first week

if ($week===1){
 
$weekday['start'] = $start;
 
}else{
 
$weekday['start'] = strtotime('+'.($week-0).' monday',$start);
 
}

// The end time of the first week

$weekday['end'] = strtotime('+1 sunday',$weekday['start']);
 
if (date('Y',$weekday['end'])!=$year){
 
$weekday['end'] = $year_end;
 
}
 
return $weekday;
 
}

/**

* Calculate how many weeks there are in a year, each week starts on Monday,

* If the last day is after Thursday (including weeks 4) Count as a complete week, otherwise it will not be included in the last week of the year

* If the first day is before Thursday (including Thursday), it will be considered as a complete week, otherwise it will not be included in the calculation The first week of the year

* @param int $year

* return int

*/

public function week($year){
 
$year_start = mktime(0,0,0,1,1,$year);
 
$year_end = mktime(0,0,0,12,31,$year);
 
if (intval(date('W',$year_end))===1){
 
return date('W',strtotime('last week',$year_end));
 
}else{
 
return date('W',$year_end);
 
}
 
}

This article explains how to get the start date and end date of the first week of a certain year in PHP Tutorial, please pay attention to php Chinese website for more related knowledge.

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