PHP: Create new node inside parent

Question

I have a root XML node called and I am trying to add a new child called to this but I am getting errors. Inside there is also children. Here is my code:

    $xml = new DomDocument();
    $xml->load(X_ASSETS);
    $xml->formatOutput = true;
    $new_id = $this->getNewAssetId();
    // Root
    $xpath = new DOMXPath($xml);
    $assets = $xpath->query('assets');
    $xml_assets = $assets->item(0);
    $xml_root = $xml->createElement('asset');
    // Asset Name
    $xml_name = $xml->createElement('name');
    $xml_name->nodeValue = $clean_name;
    $xml_root->appendChild($xml_name);
    // Asset URL
    $xml_url = $xml->createElement('url');
    $xml_url->nodeValue = '/'.$name;
    $xml_root->appendChild($xml_url);
    // Asset ID
    $xml_id = $xml->createElement('id');
    $xml_id->nodeValue = $new_id;
    $xml_root->appendChild($xml_id);


    // Create our document and save
    $xml_assets->appendChild($xml_root);
    $xml->save(X_ASSETS);

I get the following error when running this:

Fatal error: Call to a member function appendChild() on a non-object in /home/websites/zed_x/core/includes/x.inc on line 88

Does anyone know what I am doing wrong here?

It would be nice to tell which line in your code is 88. So it is known where the error manifests — Veger
– Veger, Commented Jan 10, 2010 at 23:22
If xml_assets is not an object then clearly $xpath->query('assets') is not returning what you're expecting. We don't know what your XML loaded from X_ASSETS looks like, so we can't tell you what your xpath query should be. — Mirko N.
– Mirko N., Commented Jan 10, 2010 at 23:30

Tyler Carter · Accepted Answer · 2010-01-10 23:27:39Z

2

Somehow your $xml_assets is not an object, and therefore you cannot call the function:

$xml_assets->appendChild($xml_root);

Are you certain positive that the following command returns an object?

$xml_assets = $assets->item(0);

Test it:

if(is_object($xml_assets))
{
    echo "Object Here!";
}

This might be a good way to structure your code so you can catch errors

// .... stuff .....
$xml_assets = $assets->item(0);

// ... more stuff ....

// Check for Object
if(!is_object($xml_assests))
{
     die("No Object Created!");
}

$xml_assets->appendChild($xml_root);
$xml->save(X_ASSETS);

// .... more stuff .....

edited Jan 10, 2010 at 23:27

answered Jan 10, 2010 at 23:21

Tyler Carter

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4 Comments

Nic Hubbard Over a year ago

Yes, it is an object, I tested it. Maybe $xml_assets is not?

Tyler Carter Over a year ago

Updated it. Yeah, it would be a problem with $xml_assets

Nic Hubbard Over a year ago

Yeah, $xml_assets is not an object...not sure why.

Nic Hubbard Over a year ago

I ended up using $xml->documentElement to get the root element. Which was what I was after.

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