PHP Conference Nagoya 2025

    Die Klasse XMLReader

    (PHP 5 >= 5.1.0, PHP 7, PHP 8)

    Einführung

    Die Erweiterung XMLReader ist ein fortschreitender XML-Parser (XML-Pull-Parser). Der Reader agiert wie ein Zeiger, der einen Datenstrom durchläuft und jeden vorbeikommenden Knoten der Reihe nach verarbeitet.

    Klassenbeschreibung

    class XMLReader {
    /* Konstanten */
    public const int NONE;
    public const int ELEMENT;
    public const int ATTRIBUTE;
    public const int TEXT;
    public const int CDATA;
    public const int ENTITY_REF;
    public const int ENTITY;
    public const int PI;
    public const int COMMENT;
    public const int DOC;
    public const int DOC_TYPE;
    public const int DOC_FRAGMENT;
    public const int NOTATION;
    public const int WHITESPACE;
    public const int SIGNIFICANT_WHITESPACE;
    public const int END_ELEMENT;
    public const int END_ENTITY;
    public const int XML_DECLARATION;
    public const int LOADDTD;
    public const int DEFAULTATTRS;
    public const int VALIDATE;
    public const int SUBST_ENTITIES;
    /* Eigenschaften */
    public int $attributeCount;
    public string $baseURI;
    public int $depth;
    public bool $hasAttributes;
    public bool $hasValue;
    public bool $isDefault;
    public bool $isEmptyElement;
    public string $localName;
    public string $name;
    public string $namespaceURI;
    public int $nodeType;
    public string $prefix;
    public string $value;
    public string $xmlLang;
    /* Methoden */
    public close(): true
    public expand(?DOMNode $baseNode = null): DOMNode|false
    public static fromStream(
        resource $stream,
        ?string $encoding = null,
        int $flags = 0,
        ?string $documentUri = null
    ): static
    public static fromString(string $source, ?string $encoding = null, int $flags = 0): static
    public static fromUri(string $uri, ?string $encoding = null, int $flags = 0): static
    public getAttribute(string $name): ?string
    public getAttributeNo(int $index): ?string
    public getAttributeNs(string $name, string $namespace): ?string
    public getParserProperty(int $property): bool
    public isValid(): bool
    public lookupNamespace(string $prefix): ?string
    public moveToAttribute(string $name): bool
    public moveToAttributeNo(int $index): bool
    public moveToAttributeNs(string $name, string $namespace): bool
    public moveToElement(): bool
    public moveToFirstAttribute(): bool
    public moveToNextAttribute(): bool
    public next(?string $name = null): bool
    public static open(string $uri, ?string $encoding = null, int $flags = 0): XMLReader
    public open(string $uri, ?string $encoding = null, int $flags = 0): bool
    public read(): bool
    public readInnerXml(): string
    public readOuterXml(): string
    public readString(): string
    public setParserProperty(int $property, bool $value): bool
    public setRelaxNGSchema(?string $filename): bool
    public setRelaxNGSchemaSource(?string $source): bool
    public setSchema(?string $filename): bool
    public static XML(string $source, ?string $encoding = null, int $flags = 0): XMLReader
    public XML(string $source, ?string $encoding = null, int $flags = 0): bool
    }

    Eigenschaften

    attributeCount

    Die Anzahl der Attribute des aktuellen Knotens

    baseURI

    Der Basis-URI des Knotens

    depth

    Die Tiefe des Knotens im Baum, beginnend mit 0

    hasAttributes

    Zeigt an, ob der Knoten Attribute besitzt

    hasValue

    Zeigt an, ob der Knoten einen Text-Wert besitzt

    isDefault

    Zeigt an, ob das Attribute als Standard aus der DTD übernommen wurde

    isEmptyElement

    Zeigt an, ob der Knoten ein leeres Element-Tag ist

    localName

    Der lokale Name des Knotens

    name

    Der qualifizierte Name des Knotens

    namespaceURI

    Der URI des Namensraums, welcher mit dem Knoten assoziiert ist

    nodeType

    Der Typ des Knotens

    prefix

    Das Präfix, welches mit dem Namespaces des Knotens assoziiert wird

    value

    Der Text-Wert des Knotens

    xmlLang

    Der xml:lang-Bereich, in dem sich der Knoten befindet

    Vordefinierte Konstanten

    XMLReader-Knoten-Typen

    XMLReader::NONE

    Kein Typ

    XMLReader::ELEMENT

    Start-Element

    XMLReader::ATTRIBUTE

    Attribut-Knoten

    XMLReader::TEXT

    Text-Knoten

    XMLReader::CDATA

    CDATA-Knoten

    XMLReader::ENTITY_REF

    Entitätsreferenz-Knoten

    XMLReader::ENTITY

    Entitätsdeklarations-Knoten

    XMLReader::PI

    Verarbeitungsanweisungs-Knoten

    XMLReader::COMMENT

    Kommentar-Knoten

    XMLReader::DOC

    Dokument-Knoten

    XMLReader::DOC_TYPE

    Dokumenttyp-Knoten

    XMLReader::DOC_FRAGMENT

    Dokumentfragment-Knoten

    XMLReader::NOTATION

    Notationsknoten

    XMLReader::WHITESPACE

    Whitespace-Knoten

    XMLReader::SIGNIFICANT_WHITESPACE

    Significant-Whitespace-Knoten

    XMLReader::END_ELEMENT

    Schließendes Element

    XMLReader::END_ENTITY

    Entitätsende

    XMLReader::XML_DECLARATION

    XML-Deklarations-Knoten

    XMLReader-Parser-Optionen

    XMLReader::LOADDTD

    DTD laden, aber nicht validieren

    XMLReader::DEFAULTATTRS

    DTD und Standardattribute laden, aber nicht validieren

    XMLReader::VALIDATE

    DTD laden und beim Parsen validieren

    XMLReader::SUBST_ENTITIES

    Entitäten ersetzen und Referenzen erweitern

    Inhaltsverzeichnis

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 17 notes

    up
    27
    james dot ellis at example dot com
    15 years ago
    The "XML2Assoc" functions noted here should be used with caution... basically they are duplicating the functionality already present in SimpleXML. They may work but they won't scale.

    Their are two main uses cases for parsing XML, each suited to either XMLReader or SimpleXML.

    1. SimpleXML is an excellent tool for easy access to an XML document tree using native PHP data types. It starts to flounder with massive (> 50M or so) XML documents, as it reads the entire document into memory before it can be processed. SimpleXML will just laugh at you then die when your server runs out of memory (or it will cause a load spike).

    2. Aside from the reasoning behind massive XML documents, if you have to deal with massive XML documents, use XMLReader to process them. Don't try and gather an entire XML document into a PHP data structure using XMLReader and a PHP xml2assoc() function, you are reinventing the SimpleXML wheel.
    When parsing massive XML documents using XMLReader, gather the data you need to perform an operation then perform it before skipping to the next node. Do not build massive data structures from a massive XML document, your server (and it's admins) will not like you.
    up
    3
    lee8oi at gmail dot com
    12 years ago
    Sometimes you have an unusual URL that doesn't actually point to an xml file but still returns xml as output (Like the Battlefield Heroes generated syndication urls). Using get_file_contents(url) you can retrieve the xml data from these urls and pass it as a variable for processing as an XML String.

    Unfortunately simpleXML or xml DOM cannot process all xml strings. Some have error boxes added to the end of them (such as Battlefield Heroes syndicated news). These boxes cause an end of file sort of error and closes out the script. XMLReader grabs data from these strings without error.
    up
    16
    jart (at) mail.ru
    14 years ago
    Guys, I hope this example will help
    you can erase prints showing the process-
    and it will be a piece of nice code.

    <?php
    function xml2assoc($xml, $name)
    {
    print     "<ul>";

    $tree = null;
    print(    "I'm inside " . $name . "<br>");

    while(    $xml->read())
    {
    if(    $xml->nodeType == XMLReader::END_ELEMENT)
    {
    print     "</ul>";
    return     $tree;
    }

    else if(    $xml->nodeType == XMLReader::ELEMENT)
    {
    $node = array();

    print(    "Adding " . $xml->name ."<br>");
    $node['tag'] = $xml->name;

    if(    $xml->hasAttributes)
    {
    $attributes = array();
    while(    $xml->moveToNextAttribute())
    {
    print(    "Adding attr " . $xml->name ." = " . $xml->value . "<br>");
    $attributes[$xml->name] = $xml->value;
    }
    $node['attr'] = $attributes;
    }

    if(!    $xml->isEmptyElement)
    {
    $childs = xml2assoc($xml, $node['tag']);
    $node['childs'] = $childs;
    }

    print(    $node['tag'] . " added <br>");
    $tree[] = $node;
    }

    else if(    $xml->nodeType == XMLReader::TEXT)
    {
    $node = array();
    $node['text'] = $xml->value;
    $tree[] = $node;
    print     "text added = " . $node['text'] . "<br>";
    }
    }

    print     "returning " . count($tree) . " childs<br>";
    print     "</ul>";

    return     $tree;
    }

    echo     "<PRE>";

    $xml = new XMLReader();
    $xml->open('test.xml');
    $assoc = xml2assoc($xml, "root");
    $xml->close();

    print_r($assoc);
    echo     "</PRE>";

    ?>

    It reads this xml:

    <test>
    <hallo volume="loud"> me <br/> lala </hallo>
    <hallo> me </hallo>
    </test>
    up
    10
    kula_shakerz
    11 years ago
    Found this in the IXmlReader docs at msdn but it's also valid for XMLReader in PHP.

    You should save the value of $isEmptyElement before processing attributes, or call moveToElement to make $isEmptyElement valid after processing attributes.

    $isEmptyElement returns FALSE when XMLReader is positioned on an attribute node, even if attribute's parent element is empty.
    up
    3
    Sean Colin Ruiz
    7 years ago
    As japos mentioned. Take care how you use isEmptyElement. After you are done looping through the attributes: isEmptyElement will be false. You can use moveToElement() to move the cursor back to the element and then you can use isEmptyElement like normal again.
    up
    11
    dkrnl at yandex dot ru
    11 years ago
    Wrapper XMLReader class, for simple SAX-reading huge xml:
    https://github.com/dkrnl/SimpleXMLReader

    Usage example: http://github.com/dkrnl/SimpleXMLReader/blob/master/examples/example1.php

    <?php

    /**
    * Simple XML Reader
    *
    * @license Public Domain
    * @author Dmitry Pyatkov(aka dkrnl) <dkrnl@yandex.ru>
    * @url http://github.com/dkrnl/SimpleXMLReader
    */
    class SimpleXMLReader extends XMLReader
    {

    /**
    * Callbacks
    *
    * @var array
    */
    protected $callback = array();

    /**
    * Add node callback
    *
    * @param string $name
    * @param callback $callback
    * @param integer $nodeType
    * @return SimpleXMLReader
    */
    public function registerCallback($name, $callback, $nodeType = XMLREADER::ELEMENT)
    {
    if (isset(    $this->callback[$nodeType][$name])) {
    throw new     Exception("Already exists callback $name($nodeType).");
    }
    if (!    is_callable($callback)) {
    throw new     Exception("Already exists parser callback $name($nodeType).");
    }
    $this->callback[$nodeType][$name] = $callback;
    return     $this;
    }

    /**
    * Remove node callback
    *
    * @param string $name
    * @param integer $nodeType
    * @return SimpleXMLReader
    */
    public function unRegisterCallback($name, $nodeType = XMLREADER::ELEMENT)
    {
    if (!isset(    $this->callback[$nodeType][$name])) {
    throw new     Exception("Unknow parser callback $name($nodeType).");
    }
    unset(    $this->callback[$nodeType][$name]);
    return     $this;
    }

    /**
    * Run parser
    *
    * @return void
    */
    public function parse()
    {
    if (empty(    $this->callback)) {
    throw new     Exception("Empty parser callback.");
    }
    $continue = true;
    while (    $continue && $this->read()) {
    if (isset(    $this->callback[$this->nodeType][$this->name])) {
    $continue = call_user_func($this->callback[$this->nodeType][$this->name], $this);
    }
    }
    }

    /**
    * Run XPath query on current node
    *
    * @param string $path
    * @param string $version
    * @param string $encoding
    * @return array(SimpleXMLElement)
    */
    public function expandXpath($path, $version = "1.0", $encoding = "UTF-8")
    {
    return     $this->expandSimpleXml($version, $encoding)->xpath($path);
    }

    /**
    * Expand current node to string
    *
    * @param string $version
    * @param string $encoding
    * @return SimpleXMLElement
    */
    public function expandString($version = "1.0", $encoding = "UTF-8")
    {
    return     $this->expandSimpleXml($version, $encoding)->asXML();
    }

    /**
    * Expand current node to SimpleXMLElement
    *
    * @param string $version
    * @param string $encoding
    * @param string $className
    * @return SimpleXMLElement
    */
    public function expandSimpleXml($version = "1.0", $encoding = "UTF-8", $className = null)
    {
    $element = $this->expand();
    $document = new DomDocument($version, $encoding);
    $node = $document->importNode($element, true);
    $document->appendChild($node);
    return     simplexml_import_dom($node, $className);
    }

    /**
    * Expand current node to DomDocument
    *
    * @param string $version
    * @param string $encoding
    * @return DomDocument
    */
    public function expandDomDocument($version = "1.0", $encoding = "UTF-8")
    {
    $element = $this->expand();
    $document = new DomDocument($version, $encoding);
    $node = $document->importNode($element, true);
    $document->appendChild($node);
    return     $document;
    }

    }
    ?>
    up
    5
    desk_ocean at msn dot com
    16 years ago
    make some modify from Sergey Aikinkulov's note

    <?php
    function xml2assoc(&$xml){
    $assoc = NULL;
    $n = 0;
    while(    $xml->read()){
    if(    $xml->nodeType == XMLReader::END_ELEMENT) break;
    if(    $xml->nodeType == XMLReader::ELEMENT and !$xml->isEmptyElement){
    $assoc[$n]['name'] = $xml->name;
    if(    $xml->hasAttributes) while($xml->moveToNextAttribute()) $assoc[$n]['atr'][$xml->name] = $xml->value;
    $assoc[$n]['val'] = xml2assoc($xml);
    $n++;
    }
    else if(    $xml->isEmptyElement){
    $assoc[$n]['name'] = $xml->name;
    if(    $xml->hasAttributes) while($xml->moveToNextAttribute()) $assoc[$n]['atr'][$xml->name] = $xml->value;
    $assoc[$n]['val'] = "";
    $n++;
    }
    else if(    $xml->nodeType == XMLReader::TEXT) $assoc = $xml->value;
    }
    return     $assoc;
    }
    ?>

    add else if($xml->isEmptyElement)
    may be some xml has emptyelement
    up
    8
    godseth at o2 dot pl
    16 years ago
    Thanks rein_baarsma33 AT hotmail DOT com for bugfixes.

    This is my new child of XML parsing method based on my and yours modification.

    XML2ASSOC Is a complete solution for parsing ordinary XML

    <?php
    /**
    * XML2Assoc Class to creating
    * PHP Assoc Array from XML File
    *
    * @author godseth (AT) o2.pl & rein_baarsma33 (AT) hotmail.com (Bugfixes in parseXml Method)
    * @uses XMLReader
    *
    */

    class Xml2Assoc {

    /**
    * Optimization Enabled / Disabled
    *
    * @var bool
    */
    protected $bOptimize = false;

    /**
    * Method for loading XML Data from String
    *
    * @param string $sXml
    * @param bool $bOptimize
    */

    public function parseString( $sXml , $bOptimize = false) {
    $oXml = new XMLReader();
    $this -> bOptimize = (bool) $bOptimize;
    try {

    // Set String Containing XML data
    $oXml->XML($sXml);

    // Parse Xml and return result
    return $this->parseXml($oXml);

    } catch (    Exception $e) {
    echo     $e->getMessage();
    }
    }

    /**
    * Method for loading Xml Data from file
    *
    * @param string $sXmlFilePath
    * @param bool $bOptimize
    */
    public function parseFile( $sXmlFilePath , $bOptimize = false ) {
    $oXml = new XMLReader();
    $this -> bOptimize = (bool) $bOptimize;
    try {
    // Open XML file
    $oXml->open($sXmlFilePath);

    // // Parse Xml and return result
    return $this->parseXml($oXml);

    } catch (    Exception $e) {
    echo     $e->getMessage(). ' | Try open file: '.$sXmlFilePath;
    }
    }

    /**
    * XML Parser
    *
    * @param XMLReader $oXml
    * @return array
    */
    protected function parseXml( XMLReader $oXml ) {

    $aAssocXML = null;
    $iDc = -1;

    while(    $oXml->read()){
    switch (    $oXml->nodeType) {

    case     XMLReader::END_ELEMENT:

    if (    $this->bOptimize) {
    $this->optXml($aAssocXML);
    }
    return     $aAssocXML;

    case     XMLReader::ELEMENT:

    if(!isset(    $aAssocXML[$oXml->name])) {
    if(    $oXml->hasAttributes) {
    $aAssocXML[$oXml->name][] = $oXml->isEmptyElement ? '' : $this->parseXML($oXml);
    } else {
    if(    $oXml->isEmptyElement) {
    $aAssocXML[$oXml->name] = '';
    } else {
    $aAssocXML[$oXml->name] = $this->parseXML($oXml);
    }
    }
    } elseif (    is_array($aAssocXML[$oXml->name])) {
    if (!isset(    $aAssocXML[$oXml->name][0]))
    {
    $temp = $aAssocXML[$oXml->name];
    foreach (    $temp as $sKey=>$sValue)
    unset(    $aAssocXML[$oXml->name][$sKey]);
    $aAssocXML[$oXml->name][] = $temp;
    }

    if(    $oXml->hasAttributes) {
    $aAssocXML[$oXml->name][] = $oXml->isEmptyElement ? '' : $this->parseXML($oXml);
    } else {
    if(    $oXml->isEmptyElement) {
    $aAssocXML[$oXml->name][] = '';
    } else {
    $aAssocXML[$oXml->name][] = $this->parseXML($oXml);
    }
    }
    } else {
    $mOldVar = $aAssocXML[$oXml->name];
    $aAssocXML[$oXml->name] = array($mOldVar);
    if(    $oXml->hasAttributes) {
    $aAssocXML[$oXml->name][] = $oXml->isEmptyElement ? '' : $this->parseXML($oXml);
    } else {
    if(    $oXml->isEmptyElement) {
    $aAssocXML[$oXml->name][] = '';
    } else {
    $aAssocXML[$oXml->name][] = $this->parseXML($oXml);
    }
    }
    }

    if(    $oXml->hasAttributes) {
    $mElement =& $aAssocXML[$oXml->name][count($aAssocXML[$oXml->name]) - 1];
    while(    $oXml->moveToNextAttribute()) {
    $mElement[$oXml->name] = $oXml->value;
    }
    }
    break;
    case     XMLReader::TEXT:
    case     XMLReader::CDATA:

    $aAssocXML[++$iDc] = $oXml->value;

    }
    }

    return     $aAssocXML;
    }

    /**
    * Method to optimize assoc tree.
    * ( Deleting 0 index when element
    * have one attribute / value )
    *
    * @param array $mData
    */
    public function optXml(&$mData) {
    if (    is_array($mData)) {
    if (isset(    $mData[0]) && count($mData) == 1 ) {
    $mData = $mData[0];
    if (    is_array($mData)) {
    foreach (    $mData as &$aSub) {
    $this->optXml($aSub);
    }
    }
    } else {
    foreach (    $mData as &$aSub) {
    $this->optXml($aSub);
    }
    }
    }
    }

    }

    ?>

    [EDIT BY danbrown AT php DOT net: Fixes were also provided by "Alex" and (qdog AT qview DOT org) in user notes on this page (since removed).]
    up
    4
    japos dot trash at googlemail dot com
    14 years ago
    Take care about how to use XMLReader::$isElementEmpty. I don't know if it is a bug or not, but $isElementEmpty is set for the current context and NOT just for the element. If you move your cursor to an attribute, $isElementEmpty will ALWAYS be false.

    <?php
    $xml     = new XMLReader();
    $xml->XML('<tag attr="value" />');
    $xml->read();
    var_dump($xml->isEmptyElement);
    $xml->moveToNextAttribute();
    var_dump($xml->isEmptyElement);
    ?>

    will output

    (bool) true
    (bool) false

    So be sure to store $isEmptyElement before moving the cursor.
    up
    1
    itari
    16 years ago
    <?php
    function parseXML($node,$seq,$path) {
    global     $oldpath;
    if (!    $node->read())
    return;
    if (    $node->nodeType != 15) {
    print     '<br/>'.$node->depth;
    print     '-'.$seq++;
    print     ' '.$path.'/'.($node->nodeType==3?'text() = ':$node->name);
    print     $node->value;
    if (    $node->hasAttributes) {
    print     ' [hasAttributes: ';
    while (    $node->moveToNextAttribute()) print '@'.$node->name.' = '.$node->value.' ';
    print     ']';
    }
    if (    $node->nodeType == 1) {
    $oldpath=$path;
    $path.='/'.$node->name;
    }
    parseXML($node,$seq,$path);
    }
    else     parseXML($node,$seq,$oldpath);
    }

    $source = "<tag1>this<tag2 id='4' name='foo'>is</tag2>a<tag2 id='5'>common</tag2>record</tag1>";
    $xml = new XMLReader();
    $xml->XML($source);
    print     htmlspecialchars($source).'<br/>';
    parseXML($xml,0,'');
    ?>

    Output:

    <tag1>this<tag2 id='4' name='foo'>is</tag2>a<tag2 id='5'>common</tag2>record</tag1>

    0-0 /tag1
    1-1 /tag1/text() = this
    1-2 /tag1/tag2 [hasAttributes: @id = 4 @name = foo ]
    2-3 /tag1/text() = is
    1-4 /text() = a
    1-5 /tag2 [hasAttributes: @id = 5 ]
    2-6 /text() = common
    1-7 /text() = record
    up
    1
    eef dot vreeland at gmail dot com
    7 years ago
    Please discard my previous note; I pressed 'Add Note' too quickly

    About (non-)self-closing tags:

    A) <tag></tag>
    $xmlRdr->isEmptyElement => false
    $xmlRdr->hasValue => false
    $xmlRdr->value => ''
    $xmlRdr->hasAttributes => false

    B) <tag />
    $xmlRdr->isEmptyElement => true
    $xmlRdr->hasValue => false
    $xmlRdr->value => ''
    $xmlRdr->hasAttributes => false

    C) <tag attribute="value"></tag>
    $xmlRdr->isEmptyElement => false
    $xmlRdr->hasValue => false
    $xmlRdr->value => ''
    $xmlRdr->hasAttributes => true

    D) <tag attribute="value" />
    $xmlRdr->isEmptyElement => true
    $xmlRdr->hasValue => false
    $xmlRdr->value => ''
    $xmlRdr->hasAttributes => true

    ... and always use the '===' operator when testing properties
    up
    0
    eef dot vreeland at gmail dot com
    7 years ago
    Note that when:

    A) <tag></tag>
    $xmlRdr->isEmptyElement => false
    $xmlRdr->hasValue => true
    $xmlRdr->value => ''
    $xmlRdr->hasAttributes => false

    B) <tag />
    $xmlRdr->isEmptyElement => true
    $xmlRdr->hasValue => false
    $xmlRdr->value => ''
    $xmlRdr->hasAttributes => false

    C) <tag attribute="value"></tag>
    $xmlRdr->isEmptyElement => false
    $xmlRdr->hasValue => false
    $xmlRdr->value => ''
    $xmlRdr->hasAttributes => true

    D) <tag attribute="value" />
    $xmlRdr->isEmptyElement => true
    $xmlRdr->hasValue => false
    $xmlRdr->value => ''
    $xmlRdr->hasAttributes => true
    up
    0
    casella dot email at google dot mail dot com
    12 years ago
    To verify that all nodes are read without error/warning you can use this code:
    <?php
    $endofxml     = false;
    $xml_url = "example.xml";
    $reader = new XMLReader();
    if(!    $reader->open($xml_url)){
    print     "Error to open XML: $xml_url\n";
    } else {
    while (    $reader->read()) {
    $firstnode = (!isset($firstnode)) ? $reader->name : $firstnode;
    /*
    DO SOMETHING
    */
    if ($reader->nodeType == XMLReader::END_ELEMENT && $reader->name == $firstnode) {
    $endofxml = true;
    }
    }
    }
    if(    $endofxml) {
    print     "no error found";
    } else {
    print     "error found";
    }
    ?>

    This code is useful to trap $reader->read() error/warning.
    up
    0
    boukeversteegh at gmail dot com
    15 years ago
    XML to ASSOCIATIVE ARRAY

    Improved algorithm based on Sergey Aikinkulov's. The problem was that it would overwrite nodes if they had the same tag name. Because of that <a><b/><b/><a> would be read as if <a><b/><a/>. This algorithm handles it better and outputs an easy to understand array:

    <?php
    function xml2assoc($xml) {
    $tree = null;
    while(    $xml->read())
    switch (    $xml->nodeType) {
    case     XMLReader::END_ELEMENT: return $tree;
    case     XMLReader::ELEMENT:
    $node = array('tag' => $xml->name, 'value' => $xml->isEmptyElement ? '' : xml2assoc($xml));
    if(    $xml->hasAttributes)
    while(    $xml->moveToNextAttribute())
    $node['attributes'][$xml->name] = $xml->value;
    $tree[] = $node;
    break;
    case     XMLReader::TEXT:
    case     XMLReader::CDATA:
    $tree .= $xml->value;
    }
    return     $tree;
    }

    ?>

    Usage:

    myxml.xml:
    ------
    <PERSON>
    <NAME>John</NAME>
    <PHONE type="home">555-555-555</PHONE>
    </PERSON>
    ----

    <?
    $xml = new XMLReader();
    $xml->open('myxml.xml');
    $assoc = xml2assoc($xml);
    $xml->close();
    print_r($assoc);
    ?>

    Outputs:
    Array
    (
    [0] => Array
    (
    [tag] => PERSON
    [value] => Array
    (
    [0] => Array
    (
    [tag] => NAME
    [value] => John
    )

    [1] => Array
    (
    [tag] => PHONE
    [value] => 555-555-555
    [attributes] => Array
    (
    [type] => home
    )

    )

    )

    )

    )

    For reasons that have to do with recursion, it returns an array with the ROOT xml node as the first childNode, rather than to return only the ROOT node.
    up
    0
    andrei_antal at yahoo dot com
    15 years ago
    <?php
    //Pull certain elements
    $reader = new XMLReader();
    $reader->open($xmlfile);
    while (    $reader->read()) {
    switch (    $reader->nodeType) {
    case (    XMLREADER::ELEMENT):

    if (    $reader->name == "Code")
    {
    $reader->read();
    $code = trim($reader->value);
    echo     "$code\n";
    break;
    }

    if (    $reader->name == "Name")
    {
    $reader->read();
    $customername = trim( $reader->value );
    echo     "$name\n";
    break;
    }

    if (    $reader->name == "Camp")
    {
    $camp = trim($reader->getAttribute("ID"));
    echo     "$camp\n";
    break;
    }
    }
    }
    ?>
    up
    0
    Sergey Aikinkulov
    16 years ago
    Next version xml2assoc with some improve fixes:
    - no doubled data
    - no buffer arrays

    <?php
    /*
    Read XML structure to associative array
    --
    Using:
    $xml = new XMLReader();
    $xml->open([XML file]);
    $assoc = xml2assoc($xml);
    $xml->close();
    */
    function xml2assoc($xml) {
    $assoc = null;
    while(    $xml->read()){
    switch (    $xml->nodeType) {
    case     XMLReader::END_ELEMENT: return $assoc;
    case     XMLReader::ELEMENT:
    $assoc[$xml->name][] = array('value' => $xml->isEmptyElement ? '' : xml2assoc($xml));
    if(    $xml->hasAttributes){
    $el =& $assoc[$xml->name][count($assoc[$xml->name]) - 1];
    while(    $xml->moveToNextAttribute()) $el['attributes'][$xml->name] = $xml->value;
    }
    break;
    case     XMLReader::TEXT:
    case     XMLReader::CDATA: $assoc .= $xml->value;
    }
    }
    return     $assoc;
    }
    ?>
    up
    -1
    PxL
    15 years ago
    A basic parser

    <?php
    function xml2assoc($xml) {
    $arr = array();
    if (!    preg_match_all('|\<\s*?(\w+).*?\>(.*)\<\/\s*\\1.*?\>|s', $xml, $m)) return $xml;
    if (    is_array($m[1]))
    for (    $i = 0;$i < sizeof($m[1]); $i++) $arr[$m[1][$i]] = xml2assoc($m[2][$i]);
    else     $arr[$m[1]] = xml2assoc($m[2]);

    return     $arr;
    }
    ?>
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