So, I have this code that searches for a particular node in my XML file, unsets an existing node and inserts a brand new child node with the correct data. Is there a way of getting this new data to save within the actual XML file with simpleXML? If not, is there another efficient method for doing this?

public function hint_insert() {

    foreach($this->hints as $key => $value) {

        $filename = $this->get_qid_filename($key);

        echo "$key - $filename - $value[0]<br>";

        //insert hint within right node using simplexml
        $xml = simplexml_load_file($filename);

        foreach ($xml->PrintQuestion as $PrintQuestion) {

            unset($xml->PrintQuestion->content->multichoice->feedback->hint->Passage);

            $xml->PrintQuestion->content->multichoice->feedback->hint->addChild('Passage', $value[0]);

            echo("<pre>" . print_r($PrintQuestion) . "</pre>");
            return;

        }

    }

}
Answer

Not sure I understand the issue. The asXML() method accepts an optional filename as param that will save the current structure as XML to a file. So once you have updated your XML with the hints, just save it back to file.

// Load XML with SimpleXml from string
$root = simplexml_load_string('<root><a>foo</a></root>');
// Modify a node
$root->a = 'bar';
// Saving the whole modified XML to a new filename
$root->asXml('updated.xml');
// Save only the modified node
$root->a->asXml('only-a.xml');
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If you want to save the same, you can use dom_import_simplexml to convert to a DomElement and save:

$dom = new DOMDocument('1.0');
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->loadXML($simpleXml->asXML());
echo $dom->saveXML();
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      • 1
    • I tried changing it to $dom = new DOMDocument('1.0'); $dom->preserveWhiteSpace = false; $dom->formatOutput = true; $dom->loadXML($xml->asXML()); $dom->save($filename); But still no update in the file
    • @Sarfraz Your example does not use dom_import_simplexml. You are loading the XML string from asXML(), which is the function to output or save a file with SimpleXml, so why DOM? The only advantage of using DOM is you can format the output, which is only needed when people are authoring it by hand.
    • @Gordon: I forgot to add that line but later after seeing the OP's comment he said it worked, then i didn't write anymore otherwise yes it was needed and that is now there with your comment for OP if he wishes.

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