php DOMDocument loadXML() could not handle string containing CDATA

Question

I want to search keywords in this xml file. The freshvideo.xml contains "video" tags. I want to do this: e.g., if I search "gear slow", or "new England gear", the search returns the "id" of this "video" element.

Below is a sample of my xml file.

<freshvideos>
    <video>
        <id>
            <![CDATA[ 4f1a6a21e779d227eaff33de8f571f95 ]]>
        </id>
        <title>
            <![CDATA[ New England Snowstorm - \"Low Gear\" ]]>
        </title>
        <ensub>
            <![CDATA[ I put it in low gear and take it slow. ]]>
        </ensub>
        <cnsub>
            <![CDATA[ 我挂了抵挡，慢慢开。 ]]>
        </cnsub>

        <filesrc>
            <![CDATA[ videos/New England Snowstorm Low Gear.mp4 ]]>
        </filesrc>
    </video>
</freshvideos>

I first change all the keywords into lower case, and I also change all xml elements into lower case, to make the search case insensitive.

Currently I'm doing this:

$dom = new DOMDocument;
$dom->load("freshvideos.xml");
$xml = $dom->saveXML($dom);
$xml = strtolower($xml);
$lowerCaseDom = new DOMDocument;
$lowerCaseDom->loadXML($xml);

Problem is: Warning: DOMDocument::loadXML() [domdocument.loadxml]: StartTag: invalid element name in Entity Warning: DOMDocument::loadXML() [domdocument.loadxml]: Sequence ']]>' not allowed in content in Entity

I also thought of using this delimiter:

$xml = strtolower($xml);
$xml2 =<<<XML
echo strtolower($xml);
XML;
$lowerCaseDom->loadXML($xml2);

turned out that the string has quotation marks at the beginning below the "<<

So, how can I get this lowercase search.

Thanks in advance!

$xml2 is a heredoc string, it's not valid XML. I'm not sure what you're doing there. Can't call functions inside it unless you use {} — Zarathuztra
– Zarathuztra, Commented Dec 20, 2013 at 3:16

Zarathuztra · Accepted Answer · 2013-12-20 15:13:43Z

1

When you run your document through strtolower, this is what ends up happening (remember, you're still passing around a string at this point, not a DOMDocument:

<freshvideos>
    <video>
        <id>
            <![cdata[ 4f1a6a21e779d227eaff33de8f571f95 ]]>
        </id>
        <title>
            <![cdata[ new england snowstorm - \"low gear\" ]]>
        </title>
        <ensub>
            <![cdata[ i put it in low gear and take it slow. ]]>
        </ensub>
        <cnsub>
            <![cdata[ 我挂了抵挡，慢慢开。 ]]>
        </cnsub>

        <filesrc>
            <![cdata[ videos/new england snowstorm low gear.mp4 ]]>
        </filesrc>
    </video>
</freshvideos>

Your opening CDATA tag is no longer valid once it's been lower cased like that, so you're going to get weird results when trying to process your document as xml. A CDATA section must be delimited by a string matching <![CDATA[ ]]> and nothing else.

edited Dec 20, 2013 at 15:13

answered Dec 20, 2013 at 3:45

Zarathuztra

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2 Comments

Luke Chen Over a year ago

Hi @Zarazthuztra ! You are right! How blind and stupid I was! Thank you!

Zarathuztra Over a year ago

No worries dude, we hit small issues like this all the time. "missing semicolon" errors that are so easy to diagnose they're hard :) It's going to be a little more complicated, but I'd recommend grabbing each text element in CDATA that you want, strlower it, and then working with the existing CDATA element to put in the lower cased string. Checkout this as a good starting point for working with CDATA: php.net/manual/en/class.domcdatasection.php

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