XML-Processor

PHP XML-Processor based on XMLReader.

The XMLProcessor walks through the XML-file with the \XMLReader and fires events on each node of the \XMLReader. So its ease to process huge XML files with low memory usage.

Events

The following events are available:

Event	XMLReader NodeType event const	react on	callback arguments
openFile	XmlProcessor::EVENT_OPEN_FILE	after open file before first read	NodeProcessorContext
endOfFile	XmlProcessor::EVENT_END_OF_FILE	after last read before close	NodeProcessorContext
NodeType_0	\XMLReader::NONE	No node type	NodeProcessorContext
NodeType_1	\XMLReader::ELEMENT	Start element	[OpenContext]
NodeType_2	\XMLReader::ATTRIBUTE	Attribute node	NodeProcessorContext
NodeType_3	\XMLReader::TEXT	Text node	TextContext
NodeType_4	\XMLReader::CDATA	CDATA node	NodeProcessorContext
NodeType_5	\XMLReader::ENTITY_REF	Entity Reference node	NodeProcessorContext
NodeType_6	\XMLReader::ENTITY	Entity Declaration node	NodeProcessorContext
NodeType_7	\XMLReader::PI	Processing Instruction node	NodeProcessorContext
NodeType_8	\XMLReader::COMMENT	Comment node	NodeProcessorContext
NodeType_9	\XMLReader::DOC	Document node	NodeProcessorContext
NodeType_10	\XMLReader::DOC_TYPE	Document Type node	NodeProcessorContext
NodeType_11	\XMLReader::DOC_FRAGMENT	Document Fragment node	NodeProcessorContext
NodeType_12	\XMLReader::NOTATION	Notation node	NodeProcessorContext
NodeType_13	\XMLReader::WHITESPACE	Whitespace node	NodeProcessorContext
NodeType_14	\XMLReader::SIGNIFICANT_WHITESPACE	Significant Whitespace node	NodeProcessorContext
NodeType_15	\XMLReader::END_ELEMENT	End Element	CloseContext
NodeType_16	\XMLReader::END_ENTITY	End Entity	NodeProcessorContext
NodeType_17	\XMLReader::XML_DECLARATION	XML Declaration node	NodeProcessorContext

How to use

To process an XML file, you need to create a nodeProcessor class. It has to implement the NodeProcessorInterface.

Where you can define NodeProcessorInterface::getSubscribedEvents on which events you want to react.

For easier use, you can extend the AbstractNodeProcessor class and implement one of the following interfaces:

Interface	description
OpenNodeProcessorInterface	To react on opening tags
CloseNodeProcessorInterface	To react on closing tags
TextNodeProcessorInterface	To react on text between tags

Example

To extract all values of <value> nodes of the following XML:

file.xml

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <value>foo</value>
    <value>bar</value>
    <value>baz</value>
</root>

Create a simple nodeProcessor class which collect all values of the <value> nodes.

OpenTestNodeProcessor.php

use Netlogix\XmlProcessor\NodeProcessor\AbstractNodeProcessor;
use Netlogix\XmlProcessor\NodeProcessor\OpenNodeProcessorInterface;
use Netlogix\XmlProcessor\NodeProcessor\Context\OpenContext;

class OpenValueNodeProcessor extends AbstractNodeProcessor implements OpenNodeProcessorInterface
{
    const NODE_PATH = 'value';
    private $nodeValues = [];

    public function openElement(OpenContext $context)
    {
        $xml = $context->getXmlProcessorContext()->getXmlReader();
        $node = $xml->expand();
        $this->nodeValues[] = $node->nodeValue;
    }

    function getNodeValues(): array
    {
        return $this->nodeValues;
    }
}

Create a new instance of the XmlProcessor class and attach the new nodeProcessor.

require_once 'OpenTestNodeProcessor.php';

require_once 'vendor/autoload.php';

$valueNodeProcessor = new OpenValueNodeProcessor();
$processor = new XMLProcessor([$valueNodeProcessor]);
$processor->processFile('file.xml');

var_dump($valueNodeProcessor->getNodeValues());

result:

array(3) {
  [0]=>
  string(3) "foo"
  [1]=>
  string(3) "bar"
  [2]=>
  string(3) "baz"
}