Question

Currently, im having this for appending data to my items file:

    $xmldoc = new DOMDocument();
    $xmldoc->load('ex.xml');


    $item= $xmldoc->createElement('item');

    $item->setAttribute('id', '100');
    $item->setAttribute('category', 'Fitness');
    $item->setAttribute('name', 'Basketball');
    $item->setAttribute('url', 'http://google.com');
    $item->setAttribute('description', 'This is a description');
    $item->setAttribute('price', '899');


    $xmldoc->getElementsByTagName('items')->item(0)->appendChild($item);
    $xmldoc->save('ex.xml');

Now before appending this, I would like to check for an existing element “item” that has the same attribute id value.

And if it does it should update that element with these new data.

Currently it just appends and doesnt check anything.

Answer 1

$xmldoc = new DOMDocument();
$xmldoc->load('ex.xml');

$xpath = new DOMXPath($xmldoc);
$query = $xpath->query('/mainXML/items/item[@id = "100"]');

$create_new_node = false;
if($query->length == 0)
{
    $item = $xmldoc->createElement('item');
    $create_new_node = true;
}
else
{
    $item = $query->item(0);
}

$item->setAttribute('id', '100');
$item->setAttribute('category', 'Fitness');
$item->setAttribute('name', 'Basketball');
$item->setAttribute('url', 'http://google.com');
$item->setAttribute('description', 'This is a description');
$item->setAttribute('price', '899');

if($create_new_node)
{
    $xmldoc->getElementsByTagName('items')->item(0)->appendChild($item);
}
$xmldoc->save('ex.xml');