XML edit in php

Question

In an xml file I have this structure (with <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>

and I would like to transform the <deal_image> to

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

which means keep only the first appearing jpg and discard the rest..and do that for all <post>

How can I do that with php?

So the desired output would be something like this:

<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>

Note that the deal_image tag kept only the url of the first image and ignored the rest. In my xml file there are lots of <post></post> sections, which should also be processed in an iteration.

Answer 1

First we remove all image childs of deal_image , then we assign the image value to 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();

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DEMO

http://ideone.com/HlrKM4

Answer 2

You can use DOMDocument with DOMXPath :

$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 is your XML string; if you want load XML directly from a file, you can use $dom->load( $filePath ) instead of $dom->loadXML( $xml ) )

After init of DOMDocument and DOMXPath , the foreach loop examine all <deal_image> nodes, find the value of first <image><file> , create a new <deal_image> with this found value and replace old <deal_image> with the new created.

In the demo above I have added two more <post> to test the behavior with 1 or 3 images.

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• See more about DOMDocument
• See more about DOMXPath