PHPですべての金曜日の日付を取得する

Question

PHPを使用して、指定された年のすべての金曜日の日付を表示したいと考えています。

php.net日とmaketime機能を読んだ後、私は私が開始する必要があります方法を見ていない...

は、あなたたちはこの上で私の手を与えることはできますか？

おかげで、 Crak

それを行うには

Answer 1

一つの方法は、まで、今年の最初の金曜日を見つけるのアレイに追加し、7によってインクリメントループで、配列に追加の各金曜日追加されるだろう年はもはや一致しません。

<?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; 
} 

Answer 2

これは次の金曜日から、それらのループ（この場合、13 2011年9月）：

$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 Y-m-d', $i) . '<br />'; 
} 

^{[View output]}

そしてこれ今年の初めからのループ：

$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 Y-m-d', $i) . '<br />'; 
} 

^{[View output]}

Answer 3

私はDatePeriodはこのような問題のために作られている可能性がありますと信じています。

<?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; 
} 

$fridays = getFridays('2010', 'F j, Y, g:i a T', 'America/New_York'); 
print_r($fridays); 
?> 

出力

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 
)