For 和 Foreach 循环打印多个结果答案

【问题标题】：For and Foreach Loops Print Multiple ResultsFor 和 Foreach 循环打印多个结果
【发布时间】：2018-11-02 01:00:19
【问题描述】：

这是我想要的结果：

January 2018  
Division A  
Division B  
Division C  

February 2018
Division A  
Division B  
Division C  

..so on..

在控制器中，代码如下：

$i = 0;
for ($dd = $start_date; $dd <= $last_date;) {

    $month_iteration = date("F Y",strtotime($dd));
    $data['months'][$i] = $month_iteration; // this successfully saves months in months array

    $dd = date('Y-m-d', strtotime($dd . 'next month')); // ctr++
    $i++;
}

foreach ($data['months'] as $m_key) { // for every month saved, I need to print all divisions
    $data['months'][$m_key]['divisions'] = $this->division_model->get_divisions();
}

通常，当我在 foreach 中使用 foreach 时，它可以正常工作。在这种情况下，除了使用 for 循环之外，我不确定如何在数组中保存月份。

使用上面的代码，结果：

January 2018
error Invalid argument supplied for foreach()
February 2018
error Invalid argument supplied for foreach()
Array
Division A Division B Division C
Array
Division A Division B Division C

所以它分别打印月份和除法并相乘 (?)

我已尝试使用此代码在 for 循环中保存除法：

$data['months'][$i]['divisions'] = $this->division_model->get_divisions();

当我执行var_dump($data) 时，部门没有显示任何内容。我知道我使用这种方法也是错误的。

我做错了什么？满足所需结果的最佳方法是什么？

【问题讨论】：

提供 $start_date 和 $end_date 的示例以及print_r($this->division_model->get_divisions())

标签： arrays codeigniter for-loop foreach strtotime

【解决方案1】：

我想这会对你有所帮助。

$weeks['start_date'] = '2018/01/01';
$weeks['end_date'] = '2018/08/01';
$daterange = new DatePeriod(new DateTime($weeks['start_date']), new DateInterval('P1M'), new DateTime($weeks['end_date']));
$weekDayList = array();
foreach ($daterange as $date) {
    $weekDayList[$date->format("F Y")]['divisions'] =  ['division1','division2','division3'];
}

echo "<pre>";
print_r($weekDayList);

如果这是您正在寻找的结果::

Array
(
    [January 2018] => Array
        (
            [divisions] => Array
                (
                    [0] => division1
                    [1] => division2
                    [2] => division3
                )

        )

    [February 2018] => Array
        (
            [divisions] => Array
                (
                    [0] => division1
                    [1] => division2
                    [2] => division3
                )

        )

    [March 2018] => Array
        (
            [divisions] => Array
                (
                    [0] => division1
                    [1] => division2
                    [2] => division3
                )

        )

    [April 2018] => Array
        (
            [divisions] => Array
                (
                    [0] => division1
                    [1] => division2
                    [2] => division3
                )

        )

    [May 2018] => Array
        (
            [divisions] => Array
                (
                    [0] => division1
                    [1] => division2
                    [2] => division3
                )

        )

    [June 2018] => Array
        (
            [divisions] => Array
                (
                    [0] => division1
                    [1] => division2
                    [2] => division3
                )

        )

    [July 2018] => Array
        (
            [divisions] => Array
                (
                    [0] => division1
                    [1] => division2
                    [2] => division3
                )

        )

)

【讨论】：

谢谢。它帮助我更接近结果。尽管如此，我还是做了一些修改，以发送月份数组和部门数组来查看。 :D