PHP XML：根据节点值去除元素和所有的孩子？

Question

您好！

我有一个问题，林根据一个孩子值试图删除元素（孩子的）： 这里是XML示例：

<?xml version="1.0" encoding="UTF-8"?> 
    <Businesses> 
    <Business NAME="busin1"> 
    <CHILD ID="30"><title>child Title</title> 
    <description>Child Description</description> 
    <urlToSite>http://www.MySite.co.il</urlToSite> 
    <endtime>20120720103000</endtime> 
    <starttime>20120710191500</starttime> 
    </CHILD> 
<CHILD>...</CHILD> 
<CHILD>...</CHILD> 
</Business> 
    </Businesses> 

现在我需要删除所有特定的“儿童“元（已包含儿童），其‘结束时间’值是旧的，然后现在（或简称‘结束时间’等于特定值）

‘结束时间’与格式的日期：YYYYMMDDHHMMSS

这里我的第一次尝试（没有成功）：

$doc = new DOMDocument; 
    $doc->load('MyXML.xml'); //The XML Above 

    $thedocument = $doc->documentElement; 

    //this gives you a list of the childs 
    $list = $thedocument->getElementsByTagName('CHILD'); 

    //figure out which ones you want -- assign it to a variable (ie: $nodeToRemove) 
    $nodeToRemove = null; 
$time=date("YmdHis",time()); 
    foreach ($list as $domElement){ 
$attrValue = $domElement->childNodes->item('endtime')->nodeValue; //not Sure about this!! 
     if ($attrValue > $time) { 
     $nodeToRemove = $domElement; 
     } 
    } 

    //Now remove it. 
    if ($nodeToRemove != null) 
    $thedocument->removeChild($nodeToRemove); 
    echo $doc->saveXML(); 

非常感谢！

Answer 1

再次嗨！

的研究。最后我找到了问题的一整天之后..

首先谢谢迈克尔的帮助。

下面是最终和工作代码：

<?php 

$doc = new DOMDocument; 
$doc->load('MyXML.xml'); 

$maxTime = date("YmdHis", time()); 

$xpath = new DOMXPath($doc); 
$q = "/Businesses/Bisiness/CHILD/endtime[. < {$maxTime}]"; 
foreach ($xpath->query($q) as $node) { 
    $businessNode = $node->parentNode; 
    $businessesNode = $businessNode->parentNode; 
    $businessesNode->removeChild($businessNode); 
} 

// inserting to variable ONLY 
$last = $doc->saveXml(); 
// IMPORTANT!! - we have to rewrite to XML the Results back!! 
file_put_contents('MyXML.xml', $last) 
?> 

我没有带发现了它的任何地方，所以我希望这将帮助你..再次:)

Answer 2

使用XPath查询文档节点。试试这个：

$maxTime = date("YmdHis", time()); 

$doc = new DOMDocument(); 
$doc->load("MyXML.xml"); 

$xpath = new DOMXPath($doc); 
$q = "/Businesses/Bisiness/CHILD/endtime[. > {$maxTime}]"; 
foreach ($xpath->query($q) as $node) { 
    $businessNode = $node->parentNode; 
    $businessesNode = $businessNode->parentNode; 
    $businessesNode->removeChild($businessNode); 
} 

Here's XPath的一个很好的例子。