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foreach循環中的最后一項是它遍歷的數組

[英]Last item in foreach loop is the array it is traversing

 原文  2014-06-28 00:19:03  3   2    php/ arrays/ foreach/ output

問題描述

我有幾個星期，下個星期以及持有日期，開放時間和結束時間的一周后的一周。 出於某種原因，當foreach循環到達最終日期時，它會輸出最后一周的數組而不是最終日期。 這是數組的開頭： 

$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"
                )
            ...

陣列沒有問題，因為我已將其打印出來。 這是foreach循環（它是嵌套的foreach（$ week as $ day），其中發生錯誤）： 

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;
}

誰能發現發生了什么？

編輯

我發現$ date很好，當foreach（$ date為$ week）循環在上周運行時會出現問題。

重新編輯

這是來自的功能。 請不要判斷，我繼承了這個網站：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;
}

2 個解決方案

解決方案1
 1 已采納  2014-06-28 01:57:29

TL; DR - 參考是邪惡的！

問題在於： 

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

foreach ($dates as $week) {
    // generate html from week data
}

在第一個循環結束后，最后一周仍然是一個參考，因此是$dates[count($dates) - 1] 。 在第二個循環中， $week依次分配$dates每個元素。

當涉及到最后一個元素時， $week被賦值給自己，因此創建了一個遞歸結構。

修復很簡單： 

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

或者： 

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

解決方案2
 0  2014-06-28 00:46:07

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)

因此，如果您的目標是打印“6月23日星期一”，請嘗試 

print_r(day[0][0]);

此外，下次提到你如何聲明數組，這變得容易多了。 我認為你的$ weeks數組應該從它的外觀稱為$ week。 </ tr> <tr>似乎是無意的

編輯：我發現了錯誤 

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

做一些像約會（“D jS F”，strtotime（“下周一周一+ 7天”）。這將是下周一周一+ 7天，也就是從現在起兩周后的周一。我不認為“”下周一周一“，strtotime（”下周星期一“）”是有效的語法。同樣的錯誤可能在這里： 

$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")))."'";

只是建議更好地生成日期，但對於您的商店或其他任何方式可能是最方便的。 在PHP中創建（日期，值）數組/集合/列表使用此命令創建數組，如果必須將其拆分為幾周，請使用array_chunk [$ dates，7]

重新編輯：

看看那個日期數組的最后一部分 

  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"
    )

將其更改為下周+ 7天，我認為它可能會有所幫助。

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