How to append to a XML file with PHP preferably with SimpleXML

Question

I have a XML file which looks like this:

Answer 1

With SimpleXML, you can use the addChild() method.

$file = 'xml/config.xml';

$xml = simplexml_load_file($file);

$galleries = $xml->galleries;

$gallery = $galleries->addChild('gallery');
$gallery->addChild('name', 'a gallery');
$gallery->addChild('filepath', 'path/to/gallery');
$gallery->addChild('thumb', 'mythumb.jpg');

$xml->asXML($file);

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Be aware that SimpleXML will not "format" the XML for you, however going from an unformatted SimpleXML representation to neatly indented XML is not a complicated step and is covered in lots of questions here.