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foreach循环的最后一项是它要遍历的数组

Last item in foreach loop is the array it is traversing

本文关键字：遍历 数组 一项 最后 循环 foreach | 更新日期: 2023-09-27

我有一个数组，其中包含本周、下周和下周的日期，其中包含日期、开始时间和结束时间。由于某种原因，当foreach循环到达最终日期时，它输出最后一周的数组，而不是最终日期。下面是数组的开头:

$dates = Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [0] => "Mon 23rd June"
                    [1] => "9:00am"
                    [2] => "7:00pm"
                )
            [1] => Array
                (
                    [0] => "Tue 24th June"
                    [1] => "9:00am"
                    [2] => "7:00pm"
                )
            ...
    [1] => Array
        (
            [0] => Array
                (
                    [0] => "Mon 30th June"
                    [1] => "9:00am"
                    [2] => "7:00pm"
                )
            [1] => Array
                (
                    [0] => "Tue 1st July"
                    [1] => "9:00am"
                    [2] => "7:00pm"
                )
            ...

数组没有问题，因为我已经把它打印出来了。下面是foreach循环(它是嵌套的foreach ($week as $day)，错误发生在这里):

foreach($dates as $week)
{ 
    if($i == 2)
    {
        $html .= '<table cellpadding="5" cellspacing="2" border="0" class="kc_ot_openingTable last">';
    }
    else
    {
        $html .= '<table cellpadding="5" cellspacing="2" border="0" class="kc_ot_openingTable">';
    }
    $html.= '<tr class="kc_ot_weekCommence">
        <td colspan="3">Week Commencing '.$week[0][0].'</td>
    </tr>
    <tr class="kc_ot_openingTableTitle">
        <td class="day">Day</td>
        <td class="open">Open</td>
        <td class="closed">Closed</td>
    </tr>';
    foreach($week as $day)
    {
        $html .= '<tr>
        <td>'.$day[0].'</td>
        <td class="open">'.$day[1].'</td>
        <td class="closed">'.$day[2].'</td>
    </tr>
    <tr>';
    }
    $html .= '</table>';
    ++$i;
}

有人能看出是怎么回事吗?

编辑

我已经发现$dates是好的，问题发生在foreach($dates as $week)循环在最后一周运行时。

重新编辑

这是它来自的函数。请不要评判，我继承了这个网站:P

function getOpeningHours() {
date_default_timezone_set('Europe/London');
$dates = array(
    array(
        array(
            date("D jS F", strtotime("monday this week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("tuesday this week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("wednesday this week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("thursday this week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("friday this week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("saturday this week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("sunday this week")),
            "9:00am",
            "7:00pm"
        ),
    ),
    array(
        array(
            date("D jS F", strtotime("monday next week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("tuesday next week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("wednesday next week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("thursday next week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("friday next week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("saturday next week")),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("sunday next week")),
            "9:00am",
            "7:00pm"
        ),
    ),
    array(
        array(
            date("D jS F", strtotime("monday next week", strtotime("monday next week"))),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("tuesday next week", strtotime("tuesday next week"))),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("wednesday next week", strtotime("wednesday next week"))),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("thursday next week", strtotime("thursday next week"))),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("friday next week", strtotime("friday next week"))),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("saturday next week", strtotime("saturday next week"))),
            "9:00am",
            "7:00pm"
        ),
        array(
            date("D jS F", strtotime("sunday this week", strtotime("sunday next week"))),
            "9:00am",
            "7:00pm"
        )
    ),
);
$sql[0] = "SELECT * FROM `tbl_opening_exceptions` WHERE `exception_date`  >= '".date("Y-m-d", strtotime("monday this week"))."' AND `exception_date` <= '".date("Y-m-d", strtotime("sunday this week"))."'";
$sql[1] = "SELECT * FROM `tbl_opening_exceptions` WHERE `exception_date`  >= '".date("Y-m-d", strtotime("monday next week"))."' AND `exception_date` <= '".date("Y-m-d", strtotime("sunday next week"))."'";
$sql[2] = "SELECT * FROM `tbl_opening_exceptions` WHERE `exception_date`  >= '".date("Y-m-d", strtotime("monday next week", strtotime("monday next week")))."' AND `exception_date` <= '".date("Y-m-d", strtotime("sunday next week", strtotime("sunday next week")))."'";
$i=0;
foreach($sql as $string)
{
    $result = mysql_query($string) or die(mysql_error());
    $r = mysql_fetch_array($result);
    foreach($dates[$i] as &$week)
    {
        if($week[0] == date("D jS F", strtotime($r["exception_date"])))
        {
            $week[1] =  date("g:ia", strtotime($r["exception_opening"]));
            $week[2] = date("g:ia", strtotime($r["exception_closing"]));
        }
    }
    ++$i;
}
$html = "";
$i = 0;
//print_r($dates);
foreach($dates as $week)
{ 
print_r($week);
    if($i == 2)
    {
        $html .= '<table cellpadding="5" cellspacing="2" border="0" class="kc_ot_openingTable last">';
    }
    else
    {
        $html .= '<table cellpadding="5" cellspacing="2" border="0" class="kc_ot_openingTable">';
    }
    $html.= '<tr class="kc_ot_weekCommence">
        <td colspan="3">Week Commencing '.$week[0][0].'</td>
    </tr>
    <tr class="kc_ot_openingTableTitle">
        <td class="day">Day</td>
        <td class="open">Open</td>
        <td class="closed">Closed</td>
    </tr>';
    foreach($week as $day)
    {
        $html .= '<tr>
        <td>'.$day[0].'</td>
        <td class="open">'.$day[1].'</td>
        <td class="closed">'.$day[2].'</td>
        </tr>';
    }
    $html .= '</table>';
    ++$i;
}
return $html;
}

TL;DR -引用是邪恶的!

问题在这里:

foreach ($dates[$i] as &$week) {
    // updates based on database values
}
foreach ($dates as $week) {
    // generate html from week data
}

在第一个循环结束后，最后一周仍然是一个引用，$dates[count($dates) - 1]也是。在第二个循环中，$week依次赋值$dates的每个元素。

当涉及到最后一个元素时，$week被分配给自己，从而创建了一个递归结构。

修复方法很简单:

foreach ($dates[$i] as &$week) {
    // updates based on database values
}
unset($week); // remove the reference

另外:

foreach ($dates[$i] as $week) {
    // updates based on database values
    if (<some condition>) {
        $dates[$i][1] = 'foo';
        $dates[$i][2] = 'bar';
    }
}

好的，

$weeks = array(
array(
array("Mon 23rd June", "9:00 AM", "7:00 PM"),
array("Tue 24th June", "9:00 AM", "7:00 PM"),
array("Wed 25th June", "9:00 AM", "7:00 PM") //etc
),
array() // another week 
)
$dates = array($weeks)

所以如果你的目标只是打印"Mon 23 June"，试试

print_r(day[0][0]);

另外，下次提到如何声明数组，这会变得容易得多。我认为你的$weeks数组应该被称为$week从它的外观。还有

似乎是无意的

编辑:I found the error

array(
        date("D jS F", strtotime("monday next week", strtotime("monday next week"))),
        "9:00am",
        "7:00pm"
    ),

执行date(" djs F"， strtotime("monday next week + 7 day")。这将是下周一+7天，也就是两周后的周一。我不认为"monday next week"， strtotime("monday next week")"是有效的语法。这里也可能出现同样的错误:

$sql[2] = "SELECT * FROM `tbl_opening_exceptions` WHERE `exception_date`  >= '".date("Y-m-d", strtotime("monday next week", strtotime("monday next week")))."' AND `exception_date` <= '".date("Y-m-d", strtotime("sunday next week", strtotime("sunday next week")))."'";

只是建议更好地生成日期，但对于您的商店或其他任何方式，这种方式可能是最方便的。使用这个来创建你的数组，如果你必须把它分成星期，使用array_chunk[$dates, 7]

重新编辑:

看日期数组的最后

  array(
        date("D jS F", strtotime("saturday next week", strtotime("saturday next week"))),
        "9:00am",
        "7:00pm"
    ),
    array(
        date("D jS F", strtotime("**sunday *this* week**", strtotime("sunday next week"))),
        "9:00am",
        "7:00pm"
    )

改成下周+ 7天，我想可能会好一些。

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