混淆simpleXML

Question

我有一个xml文件：

<kemo>
<cities>
    <area>area1</area >
    <city>city1</city>
    <status>Lipsum1</status>
     </cities>
<cities>
    <area>area1</area >
    <city>city2</city>
    <status>Lipsum2</status>
</cities>
<cities>
    <area >area2</area >
    <city>city3</city>
    <status>Lipsum3</status>
</cities>
<cities>
    <area >area2</area >
    <city>city4</city>
    <status>Lipsum4</status>
    </cities>
<cities>
    <area >area2</area >
    <city>city5</city>
    <status>Lipsum5</status>
</cities>
</kemo> 

我可以使用simlpeXML遍历这个xml，但是我不想重复区域名称。我想要这样一棵树：

area1   city1
        city2

area2   city3
        city4
        city5

使用

$request_url = "xml.xml";
$xml = simplexml_load_file($request_url) or die("feed not loading");
foreach($xml->kemo as $value){
   echo '<li><span>'.$value->area.' '.$value->city.'</span></li>';
}

我重复了一遍区域。我怎样才能防止重生？

Answer 1

这与SimpleXML无关。我的建议是-将整个XML加载到数组中，然后列出它。如果您首先将XML加载到数组中，您可以确保XML的列表不会再次被错误的区域顺序破坏，如area1、area2、area1。

$xml = simplexml_load_file('xml.xml') or die("feed not loading");
$data = array();
foreach($xml as $value) {
    $area = (string)$value->area;
    // $area needs to be a string when using as a array key
    $data[$area][] = $value->city;
}

然后使用$data

foreach ($data as $area_name => $cities) {
    print $area_name;
    foreach ($cities as $city) {
        print $city;
    }
}

Answer 2

您可以对此进行手动检查：

$xml = simplexml_load_file($request_url) or die("feed not loading");
foreach($xml->kemo as $value){
   ($value->area == $prev_area) ? $area = "" : $area = $value_area && $prev_area = $area);
   echo '<li><span>'.$area.' '.$value->city.'</span></li>';
}

不知道这是否会编译，但您可能会有这样的想法:)