php get day of week

1$dayofweek = date('w', strtotime($date));
2$result    = date('Y-m-d', strtotime(($day - $dayofweek).' day', strtotime($date)));

1date('w'); //gets day of week as number(0=sunday,1=monday...,6=sat)
2
3//note:returns 0 through 6 but as string so to check if monday do this:
4if(date('w') == 1){
5	echo "its monday baby";
6}

1// Prints the day
2echo date("l") . "<br>";

1
2Things to be aware of when using week numbers with years.
3
4<?php
5echo date("YW", strtotime("2011-01-07")); // gives 201101
6echo date("YW", strtotime("2011-12-31")); // gives 201152
7echo date("YW", strtotime("2011-01-01")); // gives 201152 too
8?>
9
10BUT
11
12<?php
13echo date("oW", strtotime("2011-01-07")); // gives 201101
14echo date("oW", strtotime("2011-12-31")); // gives 201152
15echo date("oW", strtotime("2011-01-01")); // gives 201052 (Year is different than previous example)
16?>
17
18Reason:
19Y is year from the date
20o is ISO-8601 year number
21W is ISO-8601 week number of year
22
23Conclusion:
24if using 'W' for the week number use 'o' for the year.
25

1<?php
2	$week=29;
3	$year=2017;
4	
5  function getStartAndEndDate($week, $year)
6  {  
7    $dateTime = new DateTime();  
8    $dateTime->setISODate($year, $week); 
9    $result['start_date'] = $dateTime->format('d-M-Y');
10    $dateTime->modify('+6 days'); 
11    $result['end_date'] = $dateTime->format('d-M-Y'); 
12    return $result;
13  }
14
15  $dates=getStartAndEndDate($week,$year);
16	print_r($dates);
17
18?>

1$dateTime = new \DateTime();
2/**
3 * You can get the string by using format
4 */
5$dateTime->format('Y-m-d H:i:s');