php中的XML编辑

Question

在一个 xml 文件中我有这个结构（<post>repeating）：

<data>
<post>
    <deal_id>479</deal_id>
    <deal_title><![CDATA[Δίπλωμα Μηχανής, στη Σχολή Οδηγών Παραστατίδης στον Εύοσμο, μόνο με 49€]]></deal_title>
    <deal_url>http://domain.com/site/shop/autokinito-el/diplwma-mixanis-sxoli-odigwn-parastatidis-euosmos/</deal_url>
    <deal_city><![CDATA[Θεσσαλονίκη]]></deal_city>
    <deal_price><![CDATA[49]]></deal_price>
    <deal_previous_price><![CDATA[125]]></deal_previous_price>
    <deal_discount><![CDATA[60.8]]></deal_discount>
    <deal_start><![CDATA[2016-01-10 00:00:00]]></deal_start>
    <deal_end><![CDATA[2016-04-01 00:00:00]]></deal_end>
    <deal_image>
        <image>
            <file>http://domain.com/site/wp-content/uploads/2015/09/c700x420.jpg</file>
            <title>c700x420</title>
            <caption></caption>
            <description></description>
            <alt></alt>
        </image>
        <image>
            <file>http://domain.com/site/wp-content/uploads/2015/09/diploma1.jpg</file>
            <title>diploma1</title>
            <caption></caption>
            <description></description>
            <alt></alt>
        </image>
    </deal_image>
    <deal_sales><![CDATA[0]]></deal_sales>
    <deal_active><![CDATA[true]]></deal_active></post></data>

我想将<deal_image> 转换为

<deal_image>http://domain.com/site/wp-content/uploads/2015/09/c700x420.jpg</deal_image>

这意味着只保留第一个出现的 jpg 并丢弃其余的..为所有 <post> 执行此操作

我怎样才能用 php 做到这一点？

所以想要的输出应该是这样的：

<data>
<post>
    <deal_id>479</deal_id>
    <deal_title><![CDATA[Δίπλωμα Μηχανής, στη Σχολή Οδηγών Παραστατίδης στον Εύοσμο, μόνο με 49€]]></deal_title>
    <deal_url>http://domain.com/site/shop/autokinito-el/diplwma-mixanis-sxoli-odigwn-parastatidis-euosmos/</deal_url>
    <deal_city><![CDATA[Θεσσαλονίκη]]></deal_city>
    <deal_price><![CDATA[49]]></deal_price>
    <deal_previous_price><![CDATA[125]]></deal_previous_price>
    <deal_discount><![CDATA[60.8]]></deal_discount>
    <deal_start><![CDATA[2016-01-10 00:00:00]]></deal_start>
    <deal_end><![CDATA[2016-04-01 00:00:00]]></deal_end>
    <deal_image>http://domain.com/site/wp-content/uploads/2015/09/c700x420.jpg</deal_image>
    <deal_sales><![CDATA[0]]></deal_sales>
    <deal_active><![CDATA[true]]></deal_active></post></data>

请注意，deal_image 标记仅保留第一张图片的 url，而忽略其余部分。在我的 xml 文件中有很多 <post></post> 部分，也应该在迭代中处理。

Answer 1

首先我们删除deal_image的所有image子节点，然后我们将图像值分配给deal_image

<?php

$dom = new DOMDocument();
$dom->formatOutput = true;
$dom->loadXML('<data>
<post>
    <deal_id>479</deal_id>
    <deal_title><![CDATA[Δίπλωμα Μηχανής, στη Σχολή Οδηγών Παραστατίδης στον Εύοσμο, μόνο με 49€]]></deal_title>
    <deal_url>http://domain.com/site/shop/autokinito-el/diplwma-mixanis-sxoli-odigwn-parastatidis-euosmos/</deal_url>
    <deal_city><![CDATA[Θεσσαλονίκη]]></deal_city>
    <deal_price><![CDATA[49]]></deal_price>
    <deal_previous_price><![CDATA[125]]></deal_previous_price>
    <deal_discount><![CDATA[60.8]]></deal_discount>
    <deal_start><![CDATA[2016-01-10 00:00:00]]></deal_start>
    <deal_end><![CDATA[2016-04-01 00:00:00]]></deal_end>
    <deal_image>
        <image>
            <file>http://domain.com/site/wp-content/uploads/2015/09/c700x420.jpg</file>
            <title>c700x420</title>
            <caption></caption>
            <description></description>
            <alt></alt>
        </image>
        <image>
            <file>http://domain.com/site/wp-content/uploads/2015/09/diploma1.jpg</file>
            <title>diploma1</title>
            <caption></caption>
            <description></description>
            <alt></alt>
        </image>
    </deal_image>
    <deal_sales><![CDATA[0]]></deal_sales>
    <deal_active><![CDATA[true]]></deal_active></post></data>');
$featuredde1 = $dom->getElementsByTagName('image');
foreach ($featuredde1 as $node) {
    $node->parentNode->removeChild($node);
}
foreach ($featuredde1 as $node) {
    $node->parentNode->removeChild($node);
}
$data = $dom->getElementsByTagName( "deal_image" );
$data ->item(0)->nodeValue = "http://domain.com/site/wp-content/uploads/2015/09/c700x420.jpg";

echo $dom->saveXML();

---

演示

http://ideone.com/HlrKM4

Answer 2

您可以将DOMDocument 与DOMXPath 一起使用：

$dom   = new DOMDocument();
$dom->loadXML( $xml, LIBXML_NOBLANKS );
$xpath = new DOMXPath( $dom );

foreach( $xpath->query( '/data/post/deal_image' ) as $deal_image )
{
    $value     = $xpath->query( './image/file', $deal_image )->item(0)->nodeValue;
    $new_node  = $dom->createElement( 'deal_image', $value );
    $deal_image->parentNode->replaceChild( $new_node, $deal_image );
}

$dom->formatOutput = True;
echo $dom->saveXML().PHP_EOL;

eval.in demo

（$xml 是您的 XML 字符串；如果您想直接从文件加载 XML，可以使用 $dom->load( $filePath ) 代替 $dom->loadXML( $xml )）

在DOMDocument和DOMXPath初始化之后，foreach循环检查所有<deal_image>节点，找到第一个<image><file>的值，用这个找到的值创建一个新的<deal_image>并替换旧的@987654336 @ 与新创建的。

在上面的演示中，我又添加了两个 <post> 来测试使用 1 或 3 个图像的行为。

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• 查看更多关于DOMXPath