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Get the date of all Fridays in PHP

I want to indicate the date of all Fridays of the year using PHP.

After reading php.net date and the maketime function, I don’t see how I can start ...

Can you guys give me a hand on this?

Thanks Crak

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3 answers

I believe that DatePeriod could be created for such a problem.

<?php function getFridays($year, $format, $timezone='UTC') { $fridays = array(); $startDate = new DateTime("{$year}-01-01 Friday", new DateTimezone($timezone)); $year++; $endDate = new DateTime("{$year}-01-01", new DateTimezone($timezone)); $int = new DateInterval('P7D'); foreach(new DatePeriod($startDate, $int, $endDate) as $d) { $fridays[] = $d->format($format); } return $fridays; } $fridays = getFridays('2010', 'F j, Y, g:ia T', 'America/New_York'); print_r($fridays); ?>

Output

 Array ( [0] => Friday, January 1, 2010 [1] => Friday, January 8, 2010 [2] => Friday, January 15, 2010 [3] => Friday, January 22, 2010 [4] => Friday, January 29, 2010 [5] => Friday, February 5, 2010 [6] => Friday, February 12, 2010 [7] => Friday, February 19, 2010 [8] => Friday, February 26, 2010 [9] => Friday, March 5, 2010 [10] => Friday, March 12, 2010 [11] => Friday, March 19, 2010 [12] => Friday, March 26, 2010 [13] => Friday, April 2, 2010 [14] => Friday, April 9, 2010 [15] => Friday, April 16, 2010 [16] => Friday, April 23, 2010 [17] => Friday, April 30, 2010 [18] => Friday, May 7, 2010 [19] => Friday, May 14, 2010 [20] => Friday, May 21, 2010 [21] => Friday, May 28, 2010 [22] => Friday, June 4, 2010 [23] => Friday, June 11, 2010 [24] => Friday, June 18, 2010 [25] => Friday, June 25, 2010 [26] => Friday, July 2, 2010 [27] => Friday, July 9, 2010 [28] => Friday, July 16, 2010 [29] => Friday, July 23, 2010 [30] => Friday, July 30, 2010 [31] => Friday, August 6, 2010 [32] => Friday, August 13, 2010 [33] => Friday, August 20, 2010 [34] => Friday, August 27, 2010 [35] => Friday, September 3, 2010 [36] => Friday, September 10, 2010 [37] => Friday, September 17, 2010 [38] => Friday, September 24, 2010 [39] => Friday, October 1, 2010 [40] => Friday, October 8, 2010 [41] => Friday, October 15, 2010 [42] => Friday, October 22, 2010 [43] => Friday, October 29, 2010 [44] => Friday, November 5, 2010 [45] => Friday, November 12, 2010 [46] => Friday, November 19, 2010 [47] => Friday, November 26, 2010 [48] => Friday, December 3, 2010 [49] => Friday, December 10, 2010 [50] => Friday, December 17, 2010 [51] => Friday, December 24, 2010 [52] => Friday, December 31, 2010 )
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One way to do this is to find the first Friday of the year by adding it to the array, and then in a loop that increases by 7, adding each additional Friday to the array until the year no longer matches.

 <?php function getFridaysForYear($y) { date_default_timezone_set('America/New_York'); $fridays = array(); $dt = strtotime("{$y}-01-01 Friday"); // Black magic :-) $wk = 0; $d = date('j', $dt); while ($wk < 52) { $fridays[] = $dt; $wk++; $d += 7; $dt = mktime(0, 0, 0, 1, $d, $y); } return $fridays; }
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These are their loops from next Friday (in this case, September 13, 2011):

 $given_year = strtotime(2011); $for_start = strtotime('Friday', $given_year); $for_end = strtotime('+1 year', $given_year); for ($i = $for_start; $i <= $for_end; $i = strtotime('+1 week', $i)) { echo date('l Ym-d', $i) . '<br />'; }

[ View output ]

And this cycle begins at the beginning of the year:

 $given_year = strtotime("1 January 2011"); $for_start = strtotime('Friday', $given_year); $for_end = strtotime('+1 year', $given_year); for ($i = $for_start; $i <= $for_end; $i = strtotime('+1 week', $i)) { echo date('l Ym-d', $i) . '<br />'; }

[ View output ]

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