Home » Php » php – How to save changed SimpleXML object back to file?

php – How to save changed SimpleXML object back to file?

Posted by: admin April 23, 2020 Leave a comment


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) {


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

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



How to&Answers:

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
// Save only the modified node


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;
echo $dom->saveXML();