I have an xml file of this structure
<?xml version="1.0" encoding="iso-8859-1"?>
<my_events>
<event id="e20111129215359">
<title>the title</title>
<channel id="1">
<name>A name</name>
<onclick></onclick>
</channel>
<event_site>
<name/>
<url/>
</event_site>
<start_date>Thu Mar 08 2012</start_date>
<start_time>11:00 AM</start_time>
<end_date>null</end_date>
<end_time>null</end_time>
<notes>Notes for the event</notes>
</event>
</my_events>
To delete an event, I have this php function.
<?php
include_once("phpshared.php");
function delete_event( $nodeid ) {
$nodes = new SimpleXMLElement('my_events.xml', LIBXML_NOCDATA, true);
$node = $nodes->xpath("/my_events/event[@id='$nodeid']");
$node->parentNode->removeChild($node);
$formatted = formatXmlString($nodes->asXML());
$file = fopen ('my_events.xml', "w");
fwrite($file, $formatted);
fclose ($file);
}
echo delete_event(trim($_REQUEST['nodeid']));
?>
That doesn't delete the node. Is there a different way to do this?
SimpleXML allows removal of elements via PHP's unset()
keyword.
For your code snippet, simply replace
$node->parentNode->removeChild($node);
with
if ( ! empty($node)) {
unset($node[0][0]);
}
If the XPath query returned a matching <event>
element, we instruct SimpleXML to unset()
it.
Aside: here are two occurrences of [0]
because:
xpath()
returns an array, even if only one element matches. So [0]
is used to get the first item in that array, which is the element we want to delete.$node[0]
represents a collection of <event>
elements (but if you access elements/attributes on it then the values from the first in the collection is used). So, we use [0]
to get at the actual SimpleXMLElement
that we want to delete, which is the first in this magical collection.Use unset()
: Remove a child with a specific attribute, in SimpleXML for PHP
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