Question

我正在使用两个数组，$ local和$ national。目前，它们都在它们自己独立的foreach循环中，我正在使用如下：

$list // 1st array
$national // 2nd array
$numberlist = array();
$numbernational = array();

foreach($list as $rows)
{
    // here I have a bunch of code that defines the variable $cheapestdeliverydate
    if(strtotime(date('DjMY', strtotime($_GET['inputDate']))) >= strtotime($cheapestdeliverydate))
    {
        $numberlist[] = $rows;
    }
}

foreach($national as $rows)
{
    // here I have a bunch of code that defines the variable $cheapestdeliverydate
    if(strtotime(date('DjMY', strtotime($_GET['inputDate']))) >= strtotime($cheapestdeliverydate))
    {
        $numbernational[] = $rows;
    }
}

有没有办法合并这两个foreach函数？我尝试了以下内容：

foreach(array_merge($list, $national) as $rows)
{
    if(strtotime(date('DjMY', strtotime($_GET['inputDate']))) >= strtotime($cheapestdeliverydate))
    {
        $numberlist[] = $rows;
        $numbernational[] = $rows;
    }
}

但不幸的是，当我在$ numberlist和$ numbernational上进行print_r时，他们都返回完全相同的数组。事后来看，这对我来说很有意义，所以我想知道我是否可以按照以下方式做点什么：

foreach($list as $row, $national as $rows)
{
    if(strtotime(date('DjMY', strtotime($_GET['inputDate']))) >= strtotime($cheapestdeliverydate))
    {
        $numberlist[] = $row;
        $numbernational[] = $rows;
    }
}

$ list和$ national数组的大小相同。

Answer 1

您可以使用SPL的MultipleIterator

一次遍历两个数组

$numberlist = [];
$numbernational = [];

$mi = new MultipleIterator();
$mi->attachIterator(new ArrayIterator($list));
$mi->attachIterator(new ArrayIterator($national));
$result = array();
foreach($mi as list($listRow, $nationalRow)) {
    if (strtotime(date('DjMY', strtotime($_GET['inputDate']))) >= strtotime($cheapestdeliverydate)) {
        $numberlist[] = $listRow;
        $numbernational[] = $nationalRow;
    }
}

Answer 2

由于您的代码逻辑，它必须只是

$list // 1st array
$national // 2nd array
$numberlist = array();
$numbernational = array();

if(strtotime(date('DjMY', strtotime($_GET['inputDate']))) >= strtotime($cheapestdeliverydate) 
    {
        $numberlist = $list;
        $numbernational = $national;
    }

Answer 3

尝试类似：

$all = array_merge($list, $national);

foreach($all as $rows)
{
    if(strtotime(date('DjMY', strtotime($_GET['inputDate']))) >= strtotime($cheapestdeliverydate))
    {
        $numberlist[] = $rows;
        $numbernational[] = $rows;
    }
}

在foreach中使用两个数组，这个例子可能吗？

3 个答案: