Класс SimpleXMLElement

To further previous comments and drive the point home:What makes SimpleXMLElement tricky to work with is that it feels and behaves like an object, but is actually a system RESOURCE,  (specifically a libxml resource).  That's why you can't store a SimpleXMLElement to $_SESSION or perform straight comparison operations on node values without first casting them to some type of object.  $_SESSION expects to store 'an object' and comparison operators expect to compare 2 'objects' and SimpleXMLElements are not objects.  When you echo or print a node's value, PHP converts the value (a resource) into a string object for you.  It's a time saver for sure, but can fool you into thinking that your SimpleXMLElement is an object.  Hope this helps clarify

To access the underlying element as a string, it's necessary to make the cast $x = (string)$my_xml_element.

Warning to anyone trying to parse XML with a key name that includes a hyphen ie.)<subscribe>    <callback-url>example url</callback-url></subscribe>In order to access the callback-url you will need to do something like the following:<?php$xml = simplexml_load_string($input);$callback = $xml->{"callback-url"};?>If you attempt to do it without the curly braces and quotes you will find out that you are returned a 0 instead of what you want.

Parsing an invalid XML string through SimpleXML causes the script to crash completely (usually) therefore it is best to make sure the XML is valid before parsing with something like this:// Must be tested with ===, as in if(isXML($xml) === true){}// Returns the error message on improper XMLfunction isXML($xml){    libxml_use_internal_errors(true);    $doc = new DOMDocument('1.0', 'utf-8');    $doc->loadXML($xml);    $errors = libxml_get_errors();    if(empty($errors)){        return true;    }    $error = $errors[0];    if($error->level < 3){        return true;    }    $explodedxml = explode("r", $xml);    $badxml = $explodedxml[($error->line)-1];    $message = $error->message . ' at line ' . $error->line . '. Bad XML: ' . htmlentities($badxml);    return $message;}

Map xml to array (with attributes)<?php declare(strict_types=1);/** * @param SimpleXMLElement $xml * @return array */function xmlToArray(SimpleXMLElement $xml): array{    $parser = function (SimpleXMLElement $xml, array $collection = []) use (&$parser) {        $nodes = $xml->children();        $attributes = $xml->attributes();        if (0 !== count($attributes)) {            foreach ($attributes as $attrName => $attrValue) {                $collection['attributes'][$attrName] = strval($attrValue);            }        }        if (0 === $nodes->count()) {            $collection['value'] = strval($xml);            return $collection;        }        foreach ($nodes as $nodeName => $nodeValue) {            if (count($nodeValue->xpath('../' . $nodeName)) < 2) {                $collection[$nodeName] = $parser($nodeValue);                continue;            }            $collection[$nodeName][] = $parser($nodeValue);        }        return $collection;    };    return [        $xml->getName() => $parser($xml)    ];}

The root node element of your input XML string is not retrievable as a property.<?php$xml="<foo>bar</foo>";$sxe=new SimpleXMLElement($xml);print $sxe->foo;?>prints nothing. You can only get to the root element via the array index method ($sxe[0]).Also, you may not have two (or more) root elements -- that is apparently not well-formed XML.<?php$xml="<foo/><bar/>";$sxe=new SimpleXMLElement($xml);?>throws an exception. A Q&D is to append an arbitraty root node structure to both ends of the input:<?php$xml="<foo/><bar/>";$sxe=new SimpleXMLElement("<z>".$xml."</z>");?>Doing this also solves the above problem of root node property accessibility. (It may not work if your XML string includes a declaration.)

Further to rmirabelle's comment, to compare two SimpleXML elements, do the comparison between the objects returned by the dom_import_simplexml function, as per:<?php if(dom_import_simplexml($simplexml_element_1)===dom_import_simplexml($simplexml_element_2)){  ... }?>You must ensure that both are SimpleXML elements before conversion to DOM objects.

Note that changing attributes from within a foreach loop, especially namespaced attributes, can be very tricky.For example, when trying to change the value of an existing xlink:href attribute:<?phpforeach($xmlelement -> attributes('xlink', true) as $attribute => $attribvalue){    $attribvalue[0] = 'value'; // Throws an error    $attribvalue = 'value'; // Does not change your XML    $xmlelement -> addAttribute($attribute, 'value', 'http://www.w3.org/1999/xlink'); // Adds an attribute, does not change existing one.    $xmlelement[$attribute] = 'value'; // Adds an attribute, does not change existing one.}?>Instead, you should access the array returned by the attributes() function directly, like this:<?php    $xmlelement -> attributes('xlink', true) -> href = 'value'; // Works!?>

XML to JSON conversion without '@attributes'<?phpfunction XML2JSON($xml) {        function normalizeSimpleXML($obj, &$result) {            $data = $obj;            if (is_object($data)) {                $data = get_object_vars($data);            }            if (is_array($data)) {                foreach ($data as $key => $value) {                    $res = null;                    normalizeSimpleXML($value, $res);                    if (($key == '@attributes') && ($key)) {                        $result = $res;                    } else {                        $result[$key] = $res;                    }                }            } else {                $result = $data;            }        }        normalizeSimpleXML(simplexml_load_string($xml), $result);        return json_encode($result);    }?>

Figuring out how to access the properties of a SimpleXmlElement object was a little tricky for me. In particular, it took a while to discover that I needed to cast my SimpleXmlElement properties to be of type "string" to print them or do comparisons on them. For instance, assuming you already have a string of xml in $xmlstr...<?php$sxml= new SimpleXmlElement($xmlstr);if ((string) $sxml->property== "somevalue") {    echo (string) $sxml->property;}?>The properties of a SimpleXmlElement object are objects themselves, so you need to put "(string)" before them, which casts their values to a string instead of an object. I assume if you were doing a numeric comparison you'd want to cast to an (int) or something numeric instead.

Hello,here goes my contribution for those whom are struggling to understand how SimpleXMLElement works.After some time trying to figure out how this works, I've came up to this small example:<?php    $xmlstr = "<?xml version='1.0' ?>\n".              // optionally you can specify a xml-stylesheet for presenting the results. just uncoment the following line and change the stylesheet name.              /* "<?xml-stylesheet type='text/xsl' href='xml_style.xsl' ?>\n". */              "<book></book>";    // create the SimpleXMLElement object with an empty <book> element    $xml = new SimpleXMLElement($xmlstr);    // add some child nodes    $xml->addChild("title", "Title of my book");    $xml->addChild("abstract", "My book is about learning to work with SimpleXMLElement");    // add some more child nodes    $chapter1 = $xml->addChild("chapter_1");    // add an attribute to child chapter_1    $chapter1->addAttribute("chapter_title", "Introduction to my book");    $chapter2 = $xml->addChild("chapter_2");    $chapter2->addAttribute("chapter_title", "Development of my book");    $chapter3 = $xml->addChild("chapter_3");    $chapter3->addAttribute("chapter_title", "Another chapter of my book");    $conclusion = $xml->addChild("conclusion", "The ending of my book");    // insert the header to tell the browser how to read the document    header("Content-type: text/xml");    // print the SimpleXMLElement as a XML well-formed string    echo $xml->asXML();?>With this script you can just copy-paste and try to understand how it works.I hope it can help somebody :)

Be aware when you trying to cast some attribute to boolean.(boolean)$xml->attributes()->someAtt;returns TRUE if attribute is array([0] => 0);use (boolean)(int) instead.

It's occasionally useful to add an XML processing instruction to a SimpleXMLElement (treating it as if it were a full document).
<?php
class SimpleXMLElement_Plus extends SimpleXMLElement {

    public function addProcessingInstruction( $name, $value )
    {
        // Create a DomElement from this simpleXML object
        $dom_sxe = dom_import_simplexml($this);
        
        // Create a handle to the owner doc of this xml
        $dom_parent = $dom_sxe->ownerDocument;
        
        // Find the topmost element of the domDocument
        $xpath = new DOMXPath($dom_parent);
        $first_element = $xpath->evaluate('/*[1]')->item(0);
        
        // Add the processing instruction before the topmost element            
        $pi = $dom_parent->createProcessingInstruction($name, $value);
        $dom_parent->insertBefore($pi, $first_element);
    }
}
?>

For example, if you had a simpleXMLElement_Plus object made out of the xml fragment:
<xml><content /></xml>

And you needed the output to be:
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="xsl/xsl.xsl"?>
<xml><content/></xml>

you could do (using the class above):
<?php
$xml = new SimpleXMLElement_Plus('<xml><content /></xml>');
$xml->addProcessingInstruction('xml-stylesheet', 'type="text/xsl" href="xsl/xsl.xsl"');
echo $xml->asXML();
?>

Important note I miss here in the documentation:SimpleXML supports Array/Iteration-Methods. Therefore it is possible to add attributesedit attributesremove attributesadd nodesedit nodesremove nodesThis is the reason why SimpleXML provides only add-methods not deleting- or editing-methods. We also need this methods because SimpleXML acts as a normal class andnew member will not converted to a new node.Deleting a node seems not to be possible within a foreach-loop. The reason is simple. To do that we need a valid key, but the Iterator only gives us a "understandable feedback" on which node we are working on: the tag name.So this will not work:<?phpforeach($doc->seg as $key => $seg){    if((string)$seg['id'] === 'whatever')    {        unset($seg); // only clears local copy        unset($seg[$key]); // wrong index "seg"    }}?>But this, eg. will work:<?phpunset($doc->seg[2]);?>In case of doubt always do a print_r/var_dump(). It nicely shows the real linked indexes.

Here is a more namespace-aware version of the earlier function for attaching one SimpleXMLElement to another.  I'm sure it could still be further improved (right now it generates some redundant xmlns definitions), but it seems to be working well enough for my purposes so far.function SimpleXMLElement_append($parent, $child){    // get all namespaces for document    $namespaces = $child->getNamespaces(true);    // check if there is a default namespace for the current node    $currentNs = $child->getNamespaces();    $defaultNs = count($currentNs) > 0 ? current($currentNs) : null;    $prefix = (count($currentNs) > 0) ? current(array_keys($currentNs)) : '';    $childName = strlen($prefix) > 1        ? $prefix . ':' . $child->getName() : $child->getName();    // check if the value is string value / data    if (trim((string) $child) == '') {        $element = $parent->addChild($childName, null, $defaultNs);    } else {        $element = $parent->addChild(            $childName, htmlspecialchars((string)$child), $defaultNs        );    }    foreach ($child->attributes() as $attKey => $attValue) {        $element->addAttribute($attKey, $attValue);    }    foreach ($namespaces as $nskey => $nsurl) {        foreach ($child->attributes($nsurl) as $attKey => $attValue) {            $element->addAttribute($nskey . ':' . $attKey, $attValue, $nsurl);        }    }    // add children -- try with namespaces first, but default to all children    // if no namespaced children are found.    $children = 0;    foreach ($namespaces as $nskey => $nsurl) {        foreach ($child->children($nsurl) as $currChild) {            SimpleXMLElement_append($element, $currChild);            $children++;        }    }    if ($children == 0) {        foreach ($child->children() as $currChild) {            SimpleXMLElement_append($element, $currChild);        }    }}

You should cast elements to a float (or even string) if you plan on using them in addition, multiplication, etc. If you don't then PHP will incorrectly treat the node values as an integer.<?php$obj = new SimpleXMLElement('<root>    <a>1.9</a>    <b>1.9</b></root>');var_dump($obj->a + $obj->b);var_dump((float)$obj->a + (float)$obj->b);var_dump((string)$obj->a + (string)$obj->b);?>The first line gives: int(2)The second and third give the expected result: float(3.8)

You can remove SimpleXMLElement nodes using php's unset() language construct.<?php    $xml = <<<'EOT'<users>    <user>        <name>orange</name>        <sex>male</sex>        <homepage>wuxiancheng.cn</homepage>    </user>    <user>        <name>tangerine</name>        <sex>male</sex>        <homepage>51-n.com</homepage>    </user></users>EOT;    $sxe = new SimpleXMLElement($xml);    // This will remove the first user node    unset($sxe->user[0]);    // This will remove all user nodes    unset($sxe->user);    echo $sxe->asXML();?>

Class with a method to transform array or object to XML:class MakeXML {    public static function array_obj_to_xml($data, \SimpleXMLElement &$xmlObj) {        foreach((array) $data as $key => $value) {            if(is_numeric($key)) {                $key = "n" . $key;            }            if(is_array($value) or is_object($value)) {                $subnode = $xmlObj->addChild($key);                self::array_obj_to_xml($value, $subnode);            } else {                $xmlObj->addChild($key, htmlspecialchars($value));            }        }    }}Example:$object = new \stdClass();$object->example = "Try this class";$objxml = new \SimpleXMLElement('<API/>');MakeXML::array_obj_to_xml($objxml, $objxml);echo $objxml->asXML();

public function crearXml(){        $pruebaXml = <<<XML<?xml version="1.0" encoding="UTF-8" ?><Root></Root>XML;$example = new SimpleXMLElement($pruebaXml); //Crea un nuevo objeto SimpleXMLElement        $example->addAttribute('id', '1');//Añade un elemento hijo al nodo XML        while( $nodo = $this->iteraciones->iterate()){            $nodos = $example->addChild('Nodo');            $nodos->addAttribute('id',$nodo->getId());            $acierto = $nodos->addChild('nuevoHijo', $nodo->getX());        }        $miFichero = $example->asXML();//Retorna un string XML correcto basado en un elemento SimpleXML        $miArchivo = fopen("xml/example.xml", "w+");//Abre un fichero o un URL        fwrite($miArchivo, $miFichero);//Escritura archivo    }

How to view, edit and remove elements.Speaking in terms of CRUD style, there is no methods to read, edit and remove nodes. But it is possible.2. How child nodes works (understanding)<?php        echo "Exercise 2 \n";                $rootNode = new SimpleXMLElement('<xml_root>complex node</xml_root>');  // Create root node        $childNode1 = $rootNode->addChild('type_one','node 1');                 // Create child node 1 with name 'type_one'        $childNode2 = new SimpleXMLElement('<type_one>node 2</type_one>');      // Create child node 2 with name 'type_one'        $childNode3 = new SimpleXMLElement('<type_two>node 3</type_two>');      // Create child node 3 with name 'type_two' (different!)        // Now $rootNode has only one children because other child nodes was created separately        // Lets paste child node to root node        echo $childNode1;        $rootNode->{'type_one'} = $childNode2;      // Note that the property name is 'type_one'        $rootNode->{'type_two'} = $childNode3;      // Note that the property name is 'type_two'        var_dump($rootNode);        /*        object(SimpleXMLElement)#68 (2) {            ["type_one"]=>            string(6) "node 2"            ["type_two"]=>            string(6) "node 3"        }        */        // We see that "node 1" disappeared, that's because assigning one node to some property of another in not a magic.        // To be clear, the real calls looks like:        $rootNode->{'type_one'}[0] = (string) $childNode2;        $rootNode->{'type_two'}[0] = (string) $childNode3;        // Explanation:        // A: (string)        // It means that you can't assign node itself, only its string representation because assigned node will be casted to string anyway.        // It also means that tag name of assigned node doesn't matter - its name will be whatever name you specified in {} braces.        // B: [0]        // The array access operator ([0]) means that each tag name (type_one and type_two) has its own collection with integer indexes.        // If you want to add another tag with same name, you should increment index:        $rootNode->{'type_one'}[1] = $childNode2;        var_dump($rootNode);        /*        object(SimpleXMLElement)#68 (2) {            ["type_one"]=>            array(2) {                [0]=>                string(6) "node 2"                [1]=>                string(6) "node 2"            }            ["type_two"]=>            string(6) "node 3"        }        */        // Note 1. The value of $childNode1 has been changed to "node 1" - that's because the child node, returned from addChild() method        // is referenced with parent node. If you change its content in one side - it changes in other side too:        $childNode1->{0} = 'renewed node 1';        // But it won't happen with $childNode2 - it is single and has no reference with parent node:        $childNode2->{0} = 'renewed node 2';        var_dump($rootNode);        /*        object(SimpleXMLElement)#68 (2) {            ["type_one"]=>            array(2) {                [0]=>                string(14) "renewed node 1"                [1]=>                string(6) "node 2"            }            ["type_two"]=>            string(6) "node 3"        }        */                // Note 2. When you added child nodes, the parent node's string content is still alive, var_dump doesn't show it,        // but you can see through echoing XML:        echo "--1--\n".$rootNode->asXML();        /*        <xml_root>complex node <--------- here!                <type_one>renewed node 1</type_one>                <type_two>node 3</type_two>                <type_one>node 2</type_one>        </xml_root>        */        // See 'complex node'? Bad news that you can't change string content anymore, if we try to call `$rootNode->{0} = 'something'` -        // it overrides all content - both string and child nodes! I don't know how to write to string content only in that case.        // But still you can read string content and remove entire node as described above.        // So the following statements gives same result, except $result variable value:        $someNode = new SimpleXMLElement('<div>text</div>');        $result = $rootNode->addChild('div','text');                    // $result is SimpleXMLElement        $result = $rootNode->addChild($someNode->getName(),$someNode);  // $result is SimpleXMLElement        $result = $rootNode->{'div'}[] = 'text*';                       // $result is string 'text*'        $result = $rootNode->{$someNode->getName()}[] = $someNode;      // $result is string 'text'?>

See previous two parts to get better understanding of how these tricks works. Example shown here refers to part two. (Sorry, length limitation)3. Tricks<?php        // The real profit is in combination of property and array accesses and unset($someNode->{0}) trick -        // it allows you to remove whatever node you want:        unset($rootNode->{'div'}[2]);   // remove node with * mark (text*)                // Another trick is removing child node using child node object        $newChildNode = $rootNode->addChild('div','text**');    // Create        unset($newChildNode->{0});      // Remove, node removed from parent object too!                echo "--2--\n".$rootNode->asXML();        /*        <xml_root>complex node                <type_one>renewed node 1</type_one>                <type_two>node 3</type_two>                <type_one>node 2</type_one>                <div>text</div>                <div>text</div>                <div>text</div>        </xml_root>        */ ?>

xml to object conversion function :<?php/**    @param:        $xml: SimpleXMLElement        $force: set to true to always create 'text', 'attribute', and 'children' even if empty    @return        object with attributs:            (string) name: XML tag name            (string) text: text content of the attribut name            (array) attributes: array witch keys are attribute key and values are attribute value            (array) children: array of objects made with xml2obj() on each child**/function xml2obj($xml,$force = false){    $obj = new StdClass();        $obj->name = $xml->getName();        $text = trim((string)$xml);    $attributes = array();    $children = array();        foreach($xml->attributes() as $k => $v){        $attributes[$k]  = (string)$v;    }        foreach($xml->children() as $k => $v){        $children[] = xml2obj($v,$force);    }            if($force or $text !== '')        $obj->text = $text;            if($force or count($attributes) > 0)        $obj->attributes = $attributes;            if($force or count($children) > 0)        $obj->children = $children;                    return $obj;}?>

Adds a new function for SimpleXMLElement class, in order to output HTML code.

<?php
class CeiXML extends SimpleXMLElement{
public function asHTML(){
$ele=dom_import_simplexml($this);
$dom = new DOMDocument('1.0', 'utf-8');
$element=$dom->importNode($ele,true);
$dom->appendChild($element);
return $dom->saveHTML();
}
}
?>

I'm using SimpleXML for, ofcourse, it's simplicity, however I did wanted to manipulate the xml and combining one SimpleXMLElement with any other, so I wrote this function to add a SimpleXMLElement-child.<?phpfunction SimpleXMLElement_append($key, $value) {    // check class    if ((get_class($key) == 'SimpleXMLElement') && (get_class($value) == 'SimpleXMLElement')) {        // check if the value is string value / data        if (trim((string) $value) == '') {            // add element and attributes            $element = $key->addChild($value->getName());            foreach ($value->attributes() as $attKey => $attValue) {                $element->addAttribute($attKey, $attValue);            }            // add children            foreach ($value->children() as $child) {                SimpleXMLElement_append($element, $child);            }        } else {            // set the value of this item            $element = $key->addChild($value->getName(), trim((string) $value));        }    } else {        // throw an error        throw new Exception('Wrong type of input parameters, expected SimpleXMLElement');    }}?>I'd recommend SimpleXMLElement to extend it's addChild() function with the functionalitity above.

Simple recursive function to append XML object into SimpleXMLElement node:<?php// root: parent element - SimpleXMLElement instance// append: XML object from simplexml_load_stringfunction xml_join($root, $append) {    if ($append) {        if (strlen(trim((string) $append))==0) {            $xml = $root->addChild($append->getName());            foreach($append->children() as $child) {                xml_join($xml, $child);            }        } else {            $xml = $root->addChild($append->getName(), (string) $append);        }        foreach($append->attributes() as $n => $v) {            $xml->addAttribute($n, $v);        }    }}$xml_append = simplexml_load_string('<data><items><item id="1">value</item></items></data>');$xml_root = new SimpleXMLElement('<result></result>');$cxml = $xml_root->addChild('clone');xml_join($cxml, $xml_append->items->item[0]);print $xml_root->asXML();?>Result:<?xml version="1.0"?><result>    <clone>        <item id="1">            value        </item>    </clone></result>

Here is a helper class to convert a PHP array to XMLYou would call it doing the following:<?php$xml = new Xml();$xml-> generateXmlFromArray($array, 'entities', 'entity');?><?phpclass Xml{    public function getXmlFromArray($value, \SimpleXMLElement &$xmlElement, $entity, $starting = null)    {        $handleValue = function($value){            if(is_string($value)){                $value = htmlspecialchars($value);            }            return $value;        };        $addChild = function($name, $value, &$subNode = null)use(&$xmlElement, $handleValue, $entity){            if(is_array($value)){                if(!$subNode instanceof \SimpleXMLElement){                    $currentKey = key($value);                    $initialValue = null;                    if(is_numeric($currentKey)){                        if(!is_array($value[$currentKey])){                            $initialValue = $value[$currentKey];                            unset($value[$currentKey]);                        }                    }                    $subNode = $xmlElement->addChild($name, $initialValue);                }                $this->getXmlFromArray($handleValue($value), $subNode, $name);            } else {                $xmlElement->addChild($name, $handleValue($value));            }        };        if(is_array($value))        {            if(is_numeric(key($value))){                $setSubNodePrimitiveValue = function($value)use(&$xmlElement, $entity, $handleValue){                    $value = $handleValue($value);                    $children = $xmlElement->children();                    $children[] = $value;                };                foreach ($value as $item)                {                    if(!is_array($item)){                        $setSubNodePrimitiveValue($item);                    } else {                        if($starting === true){                            $addChild($entity, $item);                        } else {                            $addChild($entity, $item, $xmlElement);                        }                    }                }            } else {                foreach ($value as $subEntity => $subEntityItem)                {                    $addChild($subEntity, $subEntityItem);                }            }        } else {            $xmlElement->addChild($entity, $handleValue($value));        }    }    /**     * @param array $array     * @param string $openingTag     * @param string $entity     * @param string $nameSpace     * @param bool $isPrefixed     * @return \SimpleXMLElement     */    public function generateXmlFromArray(array $array, string $openingTag, string $entity, $nameSpace = '', $isPrefixed = false)    {        $xmlString = '<'.$openingTag.'></'.$openingTag.'>';        $xml = new \SimpleXMLElement($xmlString, LIBXML_NOERROR, false, $nameSpace, $isPrefixed);        $this->getXmlFromArray($array, $xml, $entity, true);        return $xml;    }    /**     * @param string $xml     * @return bool     */    public function validateXml(string $xml)    {        $dom = new \DOMDocument();        $dom->loadXML($xml);        return $dom->validate();    }    public function loadXmlPathAsArray(string $xmlPath)    {        $xml   = simplexml_load_file($xmlPath);        $array = json_decode(json_encode($xml), TRUE);        return (array)$array;    }    /**     * @param string $xmlString     * @return array     */    public function loadXmlStringAsArray(string $xmlString)    {        $array = (array) @simplexml_load_string($xmlString);        if(!$array){            $array = (array) @json_decode($xmlString, true);        } else{            $array = (array)@json_decode(json_encode($array), true);        }        return $array;    }    /**     * @param string $xmlString     * @return \SimpleXMLElement     */    public function loadXmlString(string $xmlString)    {        return @simplexml_load_string($xmlString);    }}?>

How to view, edit and remove elements.Speaking in terms of CRUD style, there is no methods to read, edit and remove nodes. But it is possible.1. How to work with single node and its value (basics)<?php        echo "Exercise 1 \n";        // Create        $someNode = new SimpleXMLElement('<xml_root>simple node</xml_root>');        // Read        echo $someNode->{0} ."\n";      // Echoes "simple node"        echo $someNode ."\n";           // Echoes "simple node", might be used for read case too        // Edit        $someNode->{0} = 'new value';        echo $someNode->{0} ."\n";      // Echoes "new value", value is changed!        // Remove        unset($someNode->{0});        // Don't touch this node anymore otherwise it will throw a warning:        // "Warning:  SimpleXMLElement::asXML(): Node no longer exists in <...> on line <...>"        // echo $someNode ."\n";      // Throws the warning                // Recap: property access to zero property ($someNode->{0}) is the way to read and edit string content of the node AND        // to remove the node itself?>