First of all, I just found this site a few days ago and am very happy it exists.
I am facing a problem with updating a child element from a XML Node.
The xml looks like this:
<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xsl" href="books.xsl"?>
<books>
<book>
<id>1</id>
<bookname>Title 1</bookname>
<bookurl>SomeURLToMyBook</bookurl>
<clicks>0</clicks>
</book>
<book>
<id>2</id>
<bookname>Title 2</bookname>
<bookurl>SomeURLToMyBook</bookurl>
<clicks>0</clicks>
</book>
</books>
I do know how to retrieve the node for book with (e.g.) ID 2 using:
$xml= simplexml_load_file('books.xml);
I then use xpath to find the correct node. as in:
$booknum= $_GET('booklist'); //booklist is the parameter in the querystring
$arrOutput = $xml->xpath("//*[id='".$booknum."']");
What I try to achieve is to update the clicks element and then save the outcome into the existing XML.
I found several code examples on this site but neither one seems to work for me.
I probably do something wrong but I am not really familiar with PHP (learning new things every day!)
So if anybody is willing to help me out I would be grateful.
TIA
Related
SUMMARY
Load existing XML-File
Add 2 items to every child
Change order of children
Write new XML-File
DETAILED EXPLANATION
This is a shortened sample of the Source-XML-File
<?xml version="1.0" encoding="ISO-8859-1" standalone="yes"?>
<warehouse>
<inventory>
<name>Name 1</name>
<markers>
<marker>red</marker>
<marker>yellow</marker>
<marker>green</marker>
</markers>
(...)
</inventory>
<inventory>
<name>Name 2</name>
<markers>
<marker>blue</marker>
<marker>pink</marker>
<marker>brown</marker>
</markers>
(...)
</inventory>
<inventory>
<name>Name 3</name>
<markers>
<marker>black</marker>
<marker>white</marker>
<marker>marron</marker>
</markers>
(...)
</inventory>
</warehouse>
1. Load existing XML-File
Load the XML-File into a variable.
$source_xmlfile = "source.xml";
$source_xml_file_contents = simplexml_load_file($source_xmlfile);
2. Add 2 items to every child
Add 2 children to the first inventory with name and value.
$source_xml_file_contents->warehouse->inventory[0]->addChild("new1", "0.12345");
$source_xml_file_contents->warehouse->inventory[0]->addChild("new2", "17");
3. Change order of children
This is the part that doesn't work for me, no matter what I tried.
My idea was the following:
$destination_xml_file_contents = new SimpleXMLElement('<?xml version="1.0" encoding="ISO-8859-1" standalone="yes"?><warehouse></warehouse>');
foreach($source_xml_file_contents->warehouse->inventory as $inventory){
$destination_xml_file_contents->warehouse->addChild("inventory", $inventory);
}
The basic idea is that I take a child (<inventory>) out of <warehouse> and store in in a variable or maybe an array (which would be way better and easier) containing everything that <inventory> contains (including attributes and child nodes and so on).
After I have stored all <inventory> somewhere else I take a new XML and put the stored <inventory> in a new order into the new XML.
However it seems impossible to save a whole child into a variable (or an array) and add it to another XML later.
Since the order is not necessarily in order a simple sort wouldn't help me out here and since I wasn't able to get sorting to work I am at a loss here.
4. Write new XML-File
Save the new XML content to a new XML-File.
$new_xml_file = "destination.xml";
$destination_xml_file_contents->asXML($new_xml_file);
This is a shortened sample of the destination-XML-File
<?xml version="1.0" encoding="ISO-8859-1" standalone="yes"?>
<warehouse>
<inventory>
<name>Name 2</name>
<markers>
<marker>blue</marker>
<marker>pink</marker>
</marker>brown</marker>
</markers>
(...)
<new1>0.6789</new1>
<new2>115</new2>
</inventory>
<inventory>
<name>Name 1</name>
<markers>
<marker>red</marker>
<marker>yellow</marker>
</marker>green</marker>
</markers>
(...)
<new1>0.4567</new1>
<new2>4</new2>
</inventory>
<inventory>
<name>Name 3</name>
<markers>
<marker>black</marker>
<marker>white</marker>
</marker>marron</marker>
</markers>
(...)
<new1>0.1234</new1>
<new2>17</new2>
</inventory>
</warehouse>
Can someone help me to figure out how to make this work?
Right now I'm resorting to parse the whole XML-File and rewrite it line by line with string since SimpleXML doesn't seem to work.
There are a few things which I'm not sure about, but hopefully this code will show the principle of copying the nodes from one document to another (and adding content) using DOMDocument. I've added comments to the code to help, if there is anything you are unsure about, then let me know.
$inFile = "data.xml";
$input = new DOMDocument();
$input->load($inFile);
$all_inventory = $input->getElementsByTagName("inventory");
// Add new content to each item
foreach ( $all_inventory as $inventory ) {
$inventory->appendChild ( $input->createElement("new1", "0.12345"));
$inventory->appendChild ( $input->createElement("new2", "17"));
}
$outFile = "out.xml";
$output = new DOMDocument();
// Create base document for destination
$output->loadXML('<?xml version="1.0" encoding="ISO-8859-1" standalone="yes"?><warehouse />');
// Get the root element as we will be adding content to this
$outputRoot = $output->documentElement;
foreach ( $all_inventory as $inventory ) {
// Copy the element from the input document to the output document
// Note this does not add it anywhere, just makes it available
// The true option says make a deep copy
$import = $output->importNode($inventory, true);
// Add the newly imported node to the output document root
$outputRoot->appendChild($import);
}
$output->save($outFile);
The output is almost just a copy of the input document with the extra data. You could in the second foreach() loop add some logic to order the output elements in some other format, which I'm not sure what that is.
Also note there is a minor XML flaw in your document...
</marker>green</marker>
Actually I am working on a website for which I manage the database using XML file(s). I want to update the XML file which means I want to change the text in between tags of XML file. For example my XML file structure is as follows
<books>
<book>
<Name>BookName1</Name>
<Author>author1</Author>
</book>
<book>
<Name>BookName2</Name>
<Author>author2</Author>
</book>
</books>
Now what I want to do is update the BookName1 in the Name tag to BookName2. Any tag at any node likewise. I want to do it with PHP.
Have a look at SimpleXML. You can access and change your elements like an array then:
<?php
$string = '<books>
<book>
<Name>BookName1</Name>
<Author>author1</Author>
</book>
<book>
<Name>BookName2</Name>
<Author>author2</Author>
</book>
</books>';
$xml = simplexml_load_string($string);
$xml->book[0]->Name= "Something else"; // or BookName2
echo $xml->asXML();
?>
I'm trying to use unset() to delete a node in an XML using PHP and can't figure out what is going on here. It doesn't seem to work correctly and I've seen a lot of other questions of similar nature on here but they don't seem to address this issue directly. Here's what my XML looks like:
<?xml version="1.0" encoding="UTF-8"?>
<data>
<user>
<name>Test Name 1</name>
<email>test#test.com</email>
<spouse/>
</user>
<user>
<name>Test Name 2</name>
<email>anotherone#test.com</email>
<spouse>Test Name 3</spouse>
</user>
</data>
My loop that I'm using is like this:
url = 'data/users.xml';
$xml = simplexml_load_file($url);
foreach($xml->user as $theUser){
if($theUser->email[0]=="test#test.com"){
echo "test";
unset($theUser);
}
}
When the e-mail matches "test#test.com" I want to be able to delete that whole user node. It seems that this should work but I can't figure out why it wouldn't? Any help would be greatly appreciated. Thank you!
SimpleXML is fine, no need to switch to DOM, unset() is working fine, if you do it right:
unset($theUser[0]);
see it working: https://eval.in/228773
However there will be a problem with your foreach() if you delete a node mid-loop.
I suggest to use xpath() instead of a loop, IMO elegant and the code is much simpler.
$users = $xml->xpath("/data/user[email='test#test.com']");
will create an array of all <user> with that email-address.
unset($users[0][0]);
will delete the first user in that array.
foreach ($users as $user) unset($user[0]);
will delete the whole array.
see this in action: https://eval.in/228779
SimpeXML is not really meant for changing to the XML structure. Just a simple way of reading the XML.
If you want to manipulate the XML structure you should use the dom functions and more specifically the dom_import_simplexml. This function allows you to import a SimpleXML element and turn it into a DomElement that can be used for manipulation and that includes deletion.
Here is a code sample that solves your problem and demonstrates the usage of dom_import_simplexml.
<?php
$xmlData = '<?xml version="1.0" encoding="UTF-8"?>
<data>
<user>
<name>Test Name 1</name>
<email>test#test.com</email>
<spouse/>
</user>
<user>
<name>Test Name 2</name>
<email>anotherone#test.com</email>
<spouse>Test Name 3</spouse>
</user>
</data>';
$xml = simplexml_load_string($xmlData);
foreach($xml->user as $theUser){
if($theUser->email == 'test#test.com'){
$dom = dom_import_simplexml($theUser);
$dom->parentNode->removeChild($dom);
}
}
echo $xml->asXml();
When reading this code you might be thinking why this works since we dont save the new structure anywhere after we have executed the removeChild function. This works because the DOM functions does not create copies of the underlying objects but instead manipulates them directly.
Result
<?xml version="1.0" encoding="UTF-8"?>
<data>
<user>
<name>Test Name 2</name>
<email>anotherone#test.com</email>
<spouse>Test Name 3</spouse>
</user>
</data>
I've got the following xml file:
<?xml version="1.0" encoding="UTF-8"?>
<root>
<number_of_gr>
3
</number_of_gr>
<group id="0">
<name>Admins</name>
<backend>1</backend>
<every_plugin_feature> 1 </every_plugin_feature>
</group>
<group id="1">
<name>Users</name>
<backend>0</backend>
<every_plugin_feature>0</every_plugin_feature>
</group>
<group id="2">
<name>Moderators</name>
<backend>0</backend>
<every_plugin_feature>0</every_plugin_feature>
</group>
</root>
For Example: I want to delete the group with the id="0". But I don't know how to delete a child with specified attribute in simplexml.
I've tried this code:
<?php
$xml = simplexml_load_file("../xml/groups.xml");
$delgroup = $xml->xpath("/root/group[#id='".$_GET['group']."'");
unset($delgroup);
$xml-> asXML("../xml/groups.xml");
?>
But it doesn't work.
After the process, I'll fill the gap with the id=1, but I can do it without help.
My question is: How to delete the specified group?
You are almost there, just a little tweak:
$delgroup = $xml->xpath("//group[#id='".$_GET['group']."'")[0];
unset($delgroup[0]);
see it working: http://codepad.viper-7.com/ZVXs4O
This requires PHP >= 5.4.
To see a bit of theory behind it: Remove a child with a specific attribute, in SimpleXML for PHP --> see hakre's answer.
PS: Remember to change <number_of_gr> - or delete this node from the XML, because you can always get this number by...
$groups = $xml->xpath("//group");
$numberofgroups = count($groups);
<?xml version="1.0" encoding="utf-8"?>
<users>
<user>
<firstname>Mark</firstname>
<surname>Zhu</surname>
</user>
</users>
this is the user node I want to add in the front of the existing one
<user>
<firstname>Andy</firstname>
<surname>Li</surname>
</user>
The SimpleXMLElement::addChild can add the in the back of the existing one,
Is there anybody know how to add in the front?
You'll have to use DOM, in particular
DOMNode::insertBefore(DOMNode, DOMNode)
See http://www.php.net/manual/en/domnode.insertbefore.php
What if you read the xml then in a new document, printed your user node + the original xml?
I would recommend to simply add the xml-declaration by hand. You can simply output it before the xml structure.