La clase XMLReader

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

Introducción

La extensión XMLReader es un analizador de XML. El lector actúa como un cursor yendo hacia adelante en la corriente del documento y deteniéndose en cada nodo del camino.

Sinopsis de la Clase

class XMLReader {

/* Constantes */

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;

/* Propiedades */

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;

/* Métodos */

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): bool|XMLReader

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): bool|XMLReader

}

Propiedades

attributeCount: El número de atributos en el nodo
baseURI: La base URI del nodo
depth: La profundidad del nodo en el árbol, empezando en 0
hasAttributes: Indica si el nodo tiene atributos
hasValue: Indica si el nodo tiene un valor de texto
isDefault: Indica si el atributo está por defecto del DTD
isEmptyElement: Indica si el nodo es un elemento vacio de etiqueta
localName: El nombre local del nodo
name: El nombre calificado del nodo
namespaceURI: El URI del namespace asociado con el nodo
nodeType: El tipo de nodo para el nodo
prefix: El prefijo del namespace asociado con el nodo
value: El valor de texto del nodo
xmlLang: El xml: El lang scope el cual el nodo reside

Constantes predefinidas

XMLReader Node Types

XMLReader::NONE: Sin tipo de nodo
XMLReader::ELEMENT: Empieza el eleménto
XMLReader::ATTRIBUTE: El atributo del nodo
XMLReader::TEXT: El nodo de texto
XMLReader::CDATA: El CDATA del nodo
XMLReader::ENTITY_REF: La entidad de refencia del nodo
XMLReader::ENTITY: La entidad de declaración del nodo
XMLReader::PI: La instrucción de proceso del nodo
XMLReader::COMMENT: El comentario del nodo
XMLReader::DOC: El documento del nodo
XMLReader::DOC_TYPE: El tipo de documento del nodo
XMLReader::DOC_FRAGMENT: El fragmento del documento del nodo
XMLReader::NOTATION: La notación del nodo
XMLReader::WHITESPACE: El espacio en blanco del nodo
XMLReader::SIGNIFICANT_WHITESPACE: El espacio en blanco significante del nodo
XMLReader::END_ELEMENT: El fin del eleménto
XMLReader::END_ENTITY: La entidad final
XMLReader::XML_DECLARATION: La declaración XML del nodo

XMLReader Parser Options

XMLReader::LOADDTD: Carga el DTD pero no lo valida
XMLReader::DEFAULTATTRS: Carga el DTD y los atributos por defecto pero no los valida
XMLReader::VALIDATE: Carga el DTD y valida el analizado en blanco
XMLReader::SUBST_ENTITIES: Substituye las entidades y expande las referencias

Tabla de contenidos

XMLReader::close — Cierra la entrada del XMLReader
XMLReader::expand — Devuelve una copia del actual nodo como un objeto DOM
XMLReader::fromStream — Creates an XMLReader from a stream to read from
XMLReader::fromString — Creates an XMLReader from an XML string
XMLReader::fromUri — Creates an XMLReader from a URI to read from
XMLReader::getAttribute — Obtiener el valor del atributo nombrado
XMLReader::getAttributeNo — Obtiene el valor de un atributo por el indice
XMLReader::getAttributeNs — Obtiene el valor de un atributo por su nombre local y URI
XMLReader::getParserProperty — Indica si la porpiedad especificada ha sido establecida
XMLReader::isValid — Indica si el documento analizado es válido
XMLReader::lookupNamespace — Busca el namespace para un prefijo
XMLReader::moveToAttribute — Mueve el cursor a un atributo nombrado
XMLReader::moveToAttributeNo — Mueve el cursor a un atributo por su índice
XMLReader::moveToAttributeNs — Mover el cursor a un atributo dado
XMLReader::moveToElement — Posiciona el cursor en el eleménto padre del actual atributo
XMLReader::moveToFirstAttribute — Posiciona el cursor en el primer atributo
XMLReader::moveToNextAttribute — Posiciona el cursor en el siguiente atributo
XMLReader::next — Mueve el cursor al siguiente nodo saltandose todos los subárboles
XMLReader::open — Establece el URI conteniendo el XML a analizar
XMLReader::read — Se mueve al siguiente nodo en el documento
XMLReader::readInnerXml — Recupera el XML del actual nodo
XMLReader::readOuterXml — Recupera el XML del actual nodo, incluyendo él mismo
XMLReader::readString — Lee el contenido del nodo actual como string
XMLReader::setParserProperty — Establecer las opciones del analizador
XMLReader::setRelaxNGSchema — Establece el nomb re del archivo o el URI para un esquema RelaxNG
XMLReader::setRelaxNGSchemaSource — Establece los datos contenidos en un esquema RelaxNG
XMLReader::setSchema — Valida el documento en contra del XSD
XMLReader::XML — Establece el contenido del XML a analizar

Found A Problem?

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

＋add a note

User Contributed Notes 17 notes

down

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.

down

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.

down

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>

down

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.

down

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.

down

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;
    }

}
?>

down

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

down

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).]

down

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.

down

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

down

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

down

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

down

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.

down

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.

down

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;

    }

  }

}

?>

down

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;
    }
?>

down

-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;
}
?>

＋add a note