Say I have this following XML structure:
<?xml version="1.0" encoding="UTF-8"?>
<main>
<parent>
<child1>some value</child1>
<child2>another value</child2>
</parent>
</main>
I made a variable of the XML and now I want to get the values of child1, so I use SimpleXML:
$xml = new SimpleXMLElement($xml);
$this->xmlcode = (string) $xml->main->parent->child1;
But I get this message: Notice: Trying to get property of non-object in /x.php on line x
I also tried it with $xml->parent->child1, but no success.
Anyone??
$xml = new SimpleXMLElement($xml);
$this->xmlcode = (string) $xml->parent[0]->child1;
A good example of using XPath with php for the SimpleXMLElement can be found here
http://www.php.net/manual/en/class.simplexmlelement.php#95229
// Find the topmost element of the domDocument
$xpath = new DOMXPath($xml);
$child1 = $xpath->evaluate('/main/parent/child1')->item(0);
Variant for xpath (Also how to get content of node having dashes in name):
<?xml version="1.0" encoding="UTF-8"?> <main>
<parent>
<child-1>some value</child-1>
<child-2>another value</child-2>
</parent> </main>
$xml = simplexml_load_string($content);
$node_value= (string)$xml->xpath('parent/child-1')[0];
result of $node_value:
"some value"
Related
Let's say I have the following .xml file:
<?xml version="1.0" encoding="UTF-8"?>
<root>
<item>
<name>Foo</name>
</item>
<item>
<name>Bar</name>
</item>
</root>
In this sample file, I'm trying to append new nodes <item> to node <root> after the last node <item>.
I'm trying to append newly created <item> nodes after the last <item> node in the <root> node in the .xml file.
<?php
$file = new DOMDocument;
$file->load("xml.xml");
$file->loadXML($file->saveXML());
$root = $file->getElementsByTagName('root')->item(0);
foreach (["Foo_1", "Bar_2", "Foo_3", "Bar_4"] as $val) {
$item = new DOMElement('item');
$item->appendChild(new DOMElement('name', $val));
$root->appendChild(item);
}
?>
But I'm getting an error:
Fatal error: Uncaught Error: Call to a member function appendChild() on null in C:\Users\pfort\Desktop\p.php:12
Stack trace:
#0 {main}
thrown in C:\Users\user_acer\Desktop\p.php on line 12
What am I doing wrong?
There's multiple issues with your example code. I will address the error you received first:
There is no element <terminy> in your example XML, so
$root = $file->getElementsByTagName('terminy')->item(0);
will return null. That's why you are receiving the
Call to a member function appendChild() on null
error at
$root->appendChild(item);
Also, item is a typo, because it's not a valid variable name (but a name for a non-existent constant); you meant $item.
I'm assuming "terminy" means something similar to "root" in your native language and that you actually meant to write
$root = $file->getElementsByTagName('root')->item(0);
By the way: if you want a reference to the root node of an XML document, you can also use $file->docomentElement.
However, there are other issues with your example code:
$file->load("xml.xml");
$file->loadXML($file->saveXML()); // why are you reloading it in this way?
The last line is unnecessary. You are reloading the same XML again. Is it for formatting purposes? If so, there's a better option available:
$file->preserveWhiteSpace = false;
$file->formatOutput = true;
$file->load("xml.xml");
Lastly: you cannot append children to a node that has not been associated with a document yet. So, to create a new item and associate it with the document, you either do (recommended):
// automatically associate new nodes with document
$item = $file->createElement('item');
$item->appendChild($file->createElement('name', $val));
or (more cumbersome):
// import nodes to associate them with document
$item = $file->importNode(new DOMElement('item'));
$item->appendChild($file->importNode(new DOMElement('name', $val)));
So, putting it all together it becomes:
<?php
$xml = <<<'XML'
<?xml version="1.0" encoding="UTF-8"?>
<root>
<item>
<name>Foo</name>
</item>
<item>
<name>Bar</name>
</item>
</root>
XML;
$file = new DOMDocument;
$file->preserveWhiteSpace = false;
$file->formatOutput = true;
$file->loadXML($xml); // (for demo purpose loading above XML) replace this with $file->load("xml.xml"); in your actual code
$root = $file->documentElement;
foreach (["Foo_1", "Bar_2", "Foo_3", "Bar_4"] as $val) {
$item = $file->createElement('item');
$item->appendChild($file->createElement('name', $val));
$root->appendChild($item);
}
echo $file->saveXML();
**PROBLEM SOLVED**
I lost too much time on this problem. The good news is, I already know how to get what I need. Here I offer a solution - for everyone who will need to solve the same problem.
Perhaps this solution will be useful for anyone who needs it.
<?php
// snippet of xml temple
$xml = <<<XML
<item date="%s" status="%s">
<name>%s</name>
</item>
XML;
// prepare snippet
$xmlSnippet = sprintf($xml, "2022-11-21", 0, "Foo Bar");
// new DOMDocument
$dom = new DOMDocument;
$dom->preserveWhiteSpace = 0;
$dom->formatOutput = 1;
// load of .xml file content and load to DOMDocument object
$file = simplexml_load_file("xml.xml");
$dom->loadXML($file->asXML());
// creating of fragment from snippet
$fragment = $dom->createDocumentFragment();
$fragment->appendXML($xmlSnippet);
//append the snippet to the DOMDocument
// and save it to the xml.xml file
$dom->documentElement->appendChild($fragment);
$dom->save("xml.xml");
?>
Result:
example
i want to extract the line number, not jut the source
for example :
foreach($html->find('u') as $element2){
echo "$element2<br />";
}
is it possible for element2 to extract the line number also?
You can use DOMNode::getLineNo() which works like this:
<?php
// XML dump for below example
$xml = <<<XML
<?xml version="1.0" encoding="utf-8"?>
<root>
<node />
</root>
XML;
// Create a new DOMDocument instance
$dom = new DOMDocument;
// Load the XML
$dom->loadXML($xml);
// Print where the line where the 'node' element was defined in
printf('The <node> tag is defined on line %d', $dom->getElementsByTagName('node')->item(0)->getLineNo());
?>
The above example will output:
The tag is defined in line 3.
FYI: Some years ago this method stopped working due to libxml2 bug but I did an online fiddle and it worked.
I want to create an XML with the following structure:
<?xml version="1.0" encoding="UTF-8"?>
<content>
<!-- content goes here -->
</content>
I originally created the xml node like this:
$xml = new SimpleXMLElement('<xml/>');
$content = $xml->addChild('content');
// add data to content
but that doesn't allow for adding attributes to the xml node, so now I do this:
$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?>'
.'<content></content>');
For some reason it doesn't work without adding the content node, but whatever, it gets the structure right.
Now, how do I assign the content node to a variable like I did above, so I can add data to it?
In your case the $xml variable is equal to the content node just try the following:
$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?>'
.'<content></content>');
$xml->addAttribute('Attribute', 'value');
$xml->addChild('node_name', 'value');
echo $xml->asXML();
this should print
<?xml version="1.0" encoding="UTF-8"?>
<content Attribute="value"><node_name>value</node_name></content>
E.g.
<?php
$content = new SimpleXMLElement('<content />');
$content['attr']='value';
echo $content->asXML();
prints
<?xml version="1.0"?>
<content attr="value"/>
--- edit:
To keep the encoding=utf-8:
$content = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?>
<content />');
An XML document must have at least one element. That is the document element. In your question this is the content element.
You can create a SimpleXMLElement of it by just instantiating it with this minimum string:
$xml = new SimpleXMLElement('<content/>');
The variable $xml then represents that element. You can then...
... add attributes: $xml['attribute'] = 'value';
... set the content-text: $xml[0] = 'text';
... add child-elements: $xml->child = 'value';
This exemplary line-up then would have created the following XML (beautified, also: online demo):
<?xml version="1.0"?>
<content attribute="value">
text
<child>value</child>
</content>
I'm creating XML response for the one of our clients with the namespace URLs in that using PHP. I'm expecting the output as follows,
<?xml version="1.0" encoding="UTF-8"?>
<ns3:userResponse xmlns:ns3="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns2="http://www.w3.org/2001/XMLSchema">
<Content>
<field1>fieldvalue1</field1>
</Content>
</ns3:userResponse>
But by using the following code,
<?php
// create a new XML document
$doc = new DomDocument('1.0', 'UTF-8');
// create root node
$root = $doc->createElementNS('http://www.w3.org/2001/XMLSchema-instance', 'ns3:userResponse');
$root = $doc->appendChild($root);
$root->setAttributeNS('http://www.w3.org/2001/XMLSchema-instance', 'ns1:schemaLocation','');
$root->setAttributeNS('http://www.w3.org/2001/XMLSchema', 'ns2:schemaLocation','');
// add node for each row
$occ = $doc->createElement('Content');
$occ = $root->appendChild($occ);
$child = $doc->createElement("field1");
$child = $occ->appendChild($child);
$value = $doc->createTextNode('fieldvalue1');
$value = $child->appendChild($value);
// get completed xml document
$xml_string = $doc->saveXML();
echo $xml_string;
DEMO:
The demo is here, http://codepad.org/11W9dLU9
Here the problem is, the third attribute is mandatory attribute for the setAttributeNS PHP function. So, i'm getting the output as,
<?xml version="1.0" encoding="UTF-8"?>
<ns3:userResponse xmlns:ns3="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns2="http://www.w3.org/2001/XMLSchema" ns3:schemaLocation="" ns2:schemaLocation="">
<Content>
<field1>fieldvalue1</field1>
</Content>
</ns3:userResponse>
So, is there anyway to remove that ns3:schemaLocation and ns2:schemaLocation which is coming with empty value? I googled a lot but couldn't able to find any useful answers.
Any idea on this would be so great. Please help.
You create this attributes:
$root->setAttributeNS('http://www.w3.org/2001/XMLSchema-instance', 'ns1:schemaLocation','');
$root->setAttributeNS('http://www.w3.org/2001/XMLSchema', 'ns2:schemaLocation','');
remove this lines and they will be removed.
If you want to add some xmlns without using it in code is:
$attr_ns = $doc->createAttributeNS( 'http://www.w3.org/2001/XMLSchema', 'ns2:attr' );
Read this comment: http://php.net/manual/pl/domdocument.createattributens.php#98210
I need to add in a new root node to the following XML
<?xml version="1.0"?>
<unit>
<source>
<id>ANCH02</id>
<uri>http://www.hamiltonisland.biz/tabid/339/Default.aspx</uri>
</source>
</unit>
to become
<?xml version="1.0"?>
<units>
<unit>
<source>
<id>ANCH02</id>
<uri>http://www.hamiltonisland.biz/tabid/339/Default.aspx</uri>
</source>
</unit>
</units>
How could I do this? It doesn't seem like SimpleXMLElement has this functionality. I have also looked at this DomNode example http://php.net/manual/en/domnode.insertbefore.php but it doesnt seem to be able to add in a new root node.
This seem to work
$units = $dom->createElement('units');
$units->appendChild($dom->documentElement);
$dom->appendChild($units);
DEMO
DOMDocument:
$yourDOMDOMDocument ... <--- already loaded XML
$doc = new DOMDocument();
$doc->appendChild($doc->createElement('Units'));
$doc->documentElement->appendChild($doc->importNode($yourDOMDocument->documentElement));
Or. if you have your XML as SimpleXMLElement already:
$yourSimpleXML ... <--- already loaded XML
$doc = new DOMDocument();
$doc->appendChild($doc->createElement('Units'));
$domnode = dom_import_simplexml($yourSimpleXML);
$doc->documentElement->appendChild($doc->importNode($domnode));
//if you want it back as SXE:
$newSimpleXMLElement = simplexml_import_dom($doc);