Question

我有一个包含项目的数组。每个项目都有一个标题和开始日期。现在我想按周分组这些项目。如果我查看文档，格式 - ＆gt;（＆＃39; W＆＃39;）星期一星期开始。我需要把它改成星期六。

        $items = [
        [   // friday
            'title'     => 'test',
            'startdate' => '2016-03-18',    // first group
        ],
        [   // saturday
            'title'     => 'test',
            'startdate' => '2016-03-19', // second group
        ],
        [   // sunday
            'title'     => 'test',
            'startdate' => '2016-03-20', // second group
        ],
        [   // monday
            'title'     => 'test',
            'startdate' => '2016-03-21', // second group
        ],
        [   // saterday
            'title'     => 'test',
            'startdate' => '2016-03-26', // third group
        ],
    ];

我有类似的东西，但它无法正常工作

        foreach($items as $item) {
            // group by week
            $startDate      =  \DateTime::createFromFormat('Y-m-d', $item['startdate']);
            $currectWeek    = $startDate->format('W');
            $saturday       = 6;
            $friday         = 5;

            $test = clone $startDate;

            if($currectWeek !== 5){
                $test->modify('last friday');
            }

            if($currectWeek !== 6){
                $test->modify('next saturday');
            }

            $a = $test->format('W');

            if(!isset($items_by_week[$a])){
                $items_by_week[$a] = [];
            }

            $items_by_week[$a][] = [
                'title'    => $item['title'],
                'date'     => $item['startdate'],
            ];
        }

Answer 1

尝试以下代码

$startDate = \DateTime::createFromFormat('Y-m-d', $item['startdate']);
$week = intval($startDate->format('W'));
$day = intval($startDate->format('N'));

$a = ($day < 6 ) ? $week-1 : $week;

Answer 2

分组为星期（星期六开始，星期五结束）。这是结果，使用了以下代码：

$theNewDate = new DateTime(date("Y-m-d"));
$theNewDate->add(new DateInterval('PT1814400S'));
/* I use 1814400 seconds just to demonstrate one way of adding 21 days    */
/* You can just as easily use $theNewDate->add(new DateInterval('P21D')); */

$label .= '<br /><small>';
switch ( $method->method_id ) {

    case 'free_shipping':
        $label .= 'Est delivery date: ';
        $label .= $theNewDate;

}

但是现在我也想在一周内分组。所以需要类似下面的输出

$byWeek = array(); 
foreach ($items as $item) {
    $date = DateTime::createFromFormat('Y-m-d', $item['date']);

    $firstDayOfWeek = 6; // Saturday

    $difference = ($firstDayOfWeek - $date->format('N'));
    if ($difference > 0) { $difference -= 7; }
    $date->modify("$difference days");
    $week = $date->format('W');

    if(!isset($byWeek[$week])){
        $byWeek[$week] = [];
    }

    $byWeek[$week][] = $item;
}

// result
        Array
        (

        [31] => Array
            (
                [0] => Array
                    (
                        [title] => test 11
                        [date] => 2017-08-11
                    )

            )

        [32] => Array
            (
                [0] => Array
                    (
                        [title] => test
                        [date] => 2017-08-12
                    )

                [1] => Array
                    (
                        [title] => test 222
                        [date] => 2017-08-12
                    )

                [2] => Array
                    (
                        [title] => test 1
                        [date] => 2017-08-13
                    )

                [3] => Array
                    (
                        [title] => test 2
                        [date] => 2017-08-14
                    )

            )

星期六到星期五的星期几组的日期组的PHP数组

2 个答案: