Question

我的问题是我只需要从这个xml文件中下载3，这样我就不需要10个但只需要3个，

代替我得到10我将只使用3，因为我想要3个关于文件内容的最新消息，因此我听说我如何才能使我只下载3个文件

<?php
    $xml = simplexml_load_file("http://www.odin.dk/RSS/RSS.aspx?beredskabsID=d1d94661-0f60-4e67-aeff-304d22199f8a");
    echo "<table id='alarm' cellpadding=\"0\" cellspacing=\"0\">";
    echo "<tr>";
    echo "<th>Melding</th>";
    echo "<th>Tidspunkt</th>";
    echo "<th>Dato</th>";
    echo "</tr>";
    foreach ($xml->children() as $child) {
        foreach ($child as $c) {
            if ($c->getname() == "item") {
                echo "<tr>";
                echo "<td>" . $c->description . "</td>";
                echo "<td>" . $c->comments . "</td>";
                $days       = array("Mandag", "Tirsdag", "Onsdag", "Torsdag", "Fredag", "Lørdag", "Søndag");
                $months     = array("Jan", "Feb", "Mar", "Apr", "Maj", "Jun", "Jul", "Aug", "Sep", "Okt", "Nov", "Dec");
                $timestamp  = strtotime($c->pubDate);
                $dayInWeek  = $days[date('N', $timestamp)-1];
                $month      = $months[date('n', $timestamp)-1];
                $dayInMonth = date('d', $timestamp);
                $year       = date('Y', $timestamp);

                echo "<td>$dayInWeek $dayInMonth $month $year</td>";
                echo "</tr>";
            }
        }
    }
    echo "</table>";
?>

Answer 1

如果你使用xpath的组合，只选择项目节点，然后使用array_slice来获得前3个，那么你可以在删除内部foreach时执行此操作：

<?php
$xml = simplexml_load_file("http://www.odin.dk/RSS/RSS.aspx?beredskabsID=d1d94661-0f60-4e67-aeff-304d22199f8a");
echo "<table id='alarm' cellpadding=\"0\" cellspacing=\"0\">";
echo "<tr>";
echo "<th>Melding</th>";
echo "<th>Tidspunkt</th>";
echo "<th>Dato</th>";
echo "</tr>";
foreach (array_slice($xml->xpath('/rss/channel[1]/item'), 0, 3) as $c) {
    echo "<tr>";
    echo "<td>" . $c->description . "</td>";
    echo "<td>" . $c->comments . "</td>";
    $days       = array("Mandag", "Tirsdag", "Onsdag", "Torsdag", "Fredag", "Lørdag", "Søndag");
    $months     = array("Jan", "Feb", "Mar", "Apr", "Maj", "Jun", "Jul", "Aug", "Sep", "Okt", "Nov", "Dec");
    $timestamp  = strtotime($c->pubDate);
    $dayInWeek  = $days[date('N', $timestamp)-1];
    $month      = $months[date('n', $timestamp)-1];
    $dayInMonth = date('d', $timestamp);
    $year       = date('Y', $timestamp);

    echo "<td>$dayInWeek $dayInMonth $month $year</td>";
    echo "</tr>";
}
echo "</table>";
?>

Answer 2

为什么不添加一个计数器，如果它的3然后打破循环。

$i = 0;
foreach ($child as $c) {
    if ($c->getname() == "item") {
        // code
        if ($i == 3) break;
        // display code
        $i++ ;
    }
}

从simplexml元素中获取前3个子元素

2 个答案: