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SimpleXML


User Contributed Notes
SimpleXML
xananax at yelostudio dot com
24-May-2010 10:06
None of the XML2Array functions that I found satisfied me completely; Their results did not always fit the project I was working on, and I found none that would account for repeating XML elements (such as
<fields><field/><field/><field/></fields>)
So I rolled out my own; hope it helps someone.
I am just beginning in PHP so comments and corrections are more than welcomed.

<?php

/**
     * Converts a simpleXML element into an array. Preserves attributes and everything.
     * You can choose to get your elements either flattened, or stored in a custom index that
     * you define.
     * For example, for a given element
     * <field name="someName" type="someType"/>
     * if you choose to flatten attributes, you would get:
     * $array['field']['name'] = 'someName';
     * $array['field']['type'] = 'someType';
     * If you choose not to flatten, you get:
     * $array['field']['@attributes']['name'] = 'someName';
     * _____________________________________
     * Repeating fields are stored in indexed arrays. so for a markup such as:
     * <parent>
     * <child>a</child>
     * <child>b</child>
     * <child>c</child>
     * </parent>
     * you array would be:
     * $array['parent']['child'][0] = 'a';
     * $array['parent']['child'][1] = 'b';
     * ...And so on.
     * _____________________________________
     * @param simpleXMLElement $xml the XML to convert
     * @param boolean $flattenValues    Choose wether to flatten values
     *                                    or to set them under a particular index.
     *                                    defaults to true;
     * @param boolean $flattenAttributes Choose wether to flatten attributes
     *                                    or to set them under a particular index.
     *                                    Defaults to true;
     * @param boolean $flattenChildren    Choose wether to flatten children
     *                                    or to set them under a particular index.
     *                                    Defaults to true;
     * @param string $valueKey            index for values, in case $flattenValues was set to
            *                            false. Defaults to "@value"
     * @param string $attributesKey        index for attributes, in case $flattenAttributes was set to
            *                            false. Defaults to "@attributes"
     * @param string $childrenKey        index for children, in case $flattenChildren was set to
            *                            false. Defaults to "@children"
     * @return array the resulting array.
     */
   
function simpleXMLToArray($xml,
                   
$flattenValues=true,
                   
$flattenAttributes = true,
                   
$flattenChildren=true,
                   
$valueKey='@value',
                   
$attributesKey='@attributes',
                   
$childrenKey='@children'){

       
$return = array();
        if(!(
$xml instanceof SimpleXMLElement)){return $return;}
       
$name = $xml->getName();
       
$_value = trim((string)$xml);
        if(
strlen($_value)==0){$_value = null;};

        if(
$_value!==null){
            if(!
$flattenValues){$return[$valueKey] = $_value;}
            else{
$return = $_value;}
        }

       
$children = array();
       
$first = true;
        foreach(
$xml->children() as $elementName => $child){
           
$value = simpleXMLToArray($child, $flattenValues, $flattenAttributes, $flattenChildren, $valueKey, $attributesKey, $childrenKey);
            if(isset(
$children[$elementName])){
                if(
$first){
                   
$temp = $children[$elementName];
                    unset(
$children[$elementName]);
                   
$children[$elementName][] = $temp;
                   
$first=false;
                }
               
$children[$elementName][] = $value;
            }
            else{
               
$children[$elementName] = $value;
            }
        }
        if(
count($children)>0){
            if(!
$flattenChildren){$return[$childrenKey] = $children;}
            else{
$return = array_merge($return,$children);}
        }

       
$attributes = array();
        foreach(
$xml->attributes() as $name=>$value){
           
$attributes[$name] = trim($value);
        }
        if(
count($attributes)>0){
            if(!
$flattenAttributes){$return[$attributesKey] = $attributes;}
            else{
$return = array_merge($return, $attributes);}
        }
       
        return
$return;
    }

?>
svdmeer at xs4all dot nl
23-May-2010 06:57
Simple XML in an array of strings without objects:

<?php
  
function xml2array($xml) {
     
$arXML=array();
     
$arXML['name']=trim($xml->getName());
     
$arXML['value']=trim((string)$xml);
     
$t=array();
      foreach(
$xml->attributes() as $name => $value) $t[$name]=trim($value);
     
$arXML['attr']=$t;
     
$t=array();
      foreach(
$xml->children() as $name => $xmlchild) $t[$name]=xml2array($xmlchild);
     
$arXML['children']=$t;
      return(
$arXML);
   }

  
$xml = simplexml_load_file('file.xml');
   echo
'<pre>';
  
print_r(xml2array($xml));
   echo
'</pre>';
?>
Ashok dot 893 at gmail dot com
26-Apr-2010 05:48
This is very simple way to convert all applicable objects into associative array.  This works with not only SimpleXML but any kind of object. The input can be either array or object. This function also takes an options parameter as array of indices to be excluded in the return array. And keep in mind, this returns only the array of non-static and accessible variables of the object since using the function get_object_vars().

<?php
function objectsIntoArray($arrObjData, $arrSkipIndices = array())
{
   
$arrData = array();
   
   
// if input is object, convert into array
   
if (is_object($arrObjData)) {
       
$arrObjData = get_object_vars($arrObjData);
    }
   
    if (
is_array($arrObjData)) {
        foreach (
$arrObjData as $index => $value) {
            if (
is_object($value) || is_array($value)) {
               
$value = objectsIntoArray($value, $arrSkipIndices); // recursive call
           
}
            if (
in_array($index, $arrSkipIndices)) {
                continue;
            }
           
$arrData[$index] = $value;
        }
    }
    return
$arrData;
}
?>

Usage:

<?php
$xmlUrl
= "feed.xml"; // XML feed file/URL
$xmlStr = file_get_contents($xmlUrl);
$xmlObj = simplexml_load_string($xmlStr);
$arrXml = objectsIntoArray($xmlObj);
print_r($arrXml);
?>
michael dot allen at emp dot shentel dot com
15-Apr-2010 06:06
Here is a very robust SimpleXML parser.  Can be used to load files, strings, or DOM into SimpleXML, or can be used to perform the reverse when handed SimpleXML.

<?php
/**
 * XMLParser Class File
 *
 * This class loads an XML document into a SimpleXMLElement that can
 * be processed by the calling application.  This accepts xml strings,
 * files, and DOM objects.  It can also perform the reverse, converting
 * an SimpleXMLElement back into a string, file, or DOM object.
 */
class XMLParser {
   
/**
     * While parsing, parse the supplied XML document.
     *
     * Sets up a SimpleXMLElement object based on success of parsing
     * the XML document file.
     *
     * @param string $doc the xml document location path
     * @return object
     */
   
public static function loadFile($doc) {
        if (
file_exists($doc)) {
            return
simplexml_load_file($doc);
        } else {
            throw new
Exception ("Unable to load the xml file " .
                                
"using: \"$doc\"", E_USER_ERROR);
        }
    }
   
/**
     * While parsing, parse the supplied XML string.
     *
     * Sets up a SimpleXMLElement object based on success of parsing
     * the XML string.
     *
     * @param string $string the xml document string
     * @return object
     */
   
public static function loadString($string) {
        if (isset(
$string)) {
            return
simplexml_load_string($string);
        } else {
            throw new
Exception ("Unable to load the xml string " .
                                
"using: \"$string\"", E_USER_ERROR);
        }
    }
   
/**
     * While parsing, parse the supplied XML DOM node.
     *
     * Sets up a SimpleXMLElement object based on success of parsing
     * the XML DOM node.
     *
     * @param object $dom the xml DOM node
     * @return object
     */
   
public static function loadDOM($dom) {
        if (isset(
$dom)) {
            return
simplexml_import_dom($dom);
        } else {
            throw new
Exception ("Unable to load the xml DOM node " .
                                
"using: \"$dom\"", E_USER_ERROR);
        }
    }
   
/**
     * While parsing, parse the SimpleXMLElement.
     *
     * Sets up a XML file, string, or DOM object based on success of
     * parsing the XML DOM node.
     *
     * @param object $path the xml document location path
     * @param string $type the return type (string, file, dom)
     * @param object $simplexml the simple xml element
     * @return mixed
     */
   
public static function loadSXML($simplexml, $type, $path) {
        if (isset(
$simplexml) && isset($type)) {
        switch (
$type) {
            case
'string':
                return
$simplexml->asXML();
            break;
            case
'file':
                if (isset(
$path)) {
                    return
$simplexml->asXML($path);
                } else {
                    throw new
Exception ("Unable to create the XML file. Path is missing or" .
                                        
"is invalid: \"$path\"", E_USER_ERROR);
                }
            break;
            case
'dom':
                return
dom_import_simplexml($simplexml);
            break;
        }
        } else {
            throw new
Exception ("Unable to load the simple XML element " .
                                
"using: \"$simplexml\"", E_USER_ERROR);
        }
    }
}
?>
emmanuel
17-Feb-2010 06:21
dynamic sql in php using xml:

test.xml:
<?xml version="1.0" encoding="UTF-8"?>
<sql>
    <statement>
        SELECT * FROM USERS
        <call criteria="byId">WHERE id = %d</call>
        <call criteria="byUsername">WHERE username = "%s"</call>;
    </statement>
</sql>

index.php:
<?php
function callMe($param) {
   
$search = array('byUsername' => 'dynsql');
   
    if (isset(
$search[$param[1]])) {
        return
sprintf($param[2], $search[$param[1]]);
    }
   
    return
"";
}

$xml = simplexml_load_file("test.xml");
$string = $xml->statement->asXML();
$string = preg_replace_callback('/<call criteria="(\w+)">(.*?)<\/call>/', 'callMe', $string);
$node = simplexml_load_string($string);
echo
$node;
?>

obviously, this example can be improved [in your own code.]
jakep at insperia dot com
28-Jan-2010 09:44
If you decide to include a hyphen or a dash in the name of your attribute things get a bit interesting. The code has to be adjusted since the name of a class method cannot contain "-". To make it work, the attribute name has to include braces and single quotes (e.g. "{'name'}").

Credit http://aaronz-sakai.blogspot.com
mahmutta at gmail dot com
20-Jan-2010 08:58
while using simple xml and get double or float int value from xml object for using math operations (+ * - / ) some errors happens on the operation, this is because of simple xml returns everythings to objects.
exmple;

<?php

$name
= "somestring";
$size = 11.45;
$xml = '
<xml>
 <name>somestring</name>
 <size>11.45</size>
</xml>'
;

 
$xmlget = simplexml_load_string($xml)

echo
$xml->size*2;    // 20  its false
// ($xml->size is an object (int)11 and  (45) )

// this is true
echo $size*2;            // 22.90
echo (float)$size*2;   // 22.90
?>
Danny from holland
03-Dec-2009 01:58
I tested all the scripts ive found on this page but none of them wasnt working.

ive made an new script that will work and wont get any memory errors with big xml feeds

<?php
print "<pre>";

$root = simplexml_load_string($XML_URL);
$data = get_object_vars($root);

$producten = array();

foreach (
$data['product'] as $keys => $values) {
   
$producten['product'][$keys] = get_object_vars($data['product']);
   
    foreach (
$values as $key => $value) {
       
$value = str_replace("\r\n", '<br />', $value);
       
$value = str_replace("\r", '<br />', $value);
       
$value = str_replace("\n", '<br />', $value);
       
$producten['product'][$keys][$key] = $value;
    }
   
}
print_R($producten);

print
"</pre>";
?>
antoine dot rabanes at gmail dot com
16-Oct-2009 02:22
if for some reasons you need the string value instead of the simpleXML Object you can cast the return value as a string.

exemple:

<?php
$all_api_call
= simplexml_load_file($url);
$all_api = array();
$all_api = $all_api_call->result;
$list_all_api_name = array();
$i = 0;
foreach (
$all_api->children() as $funcky_function)
{
   
$string_tmp = (string )$funcky_function->function;
   
$list_all_api_name[$i++] = $putain;
}
?>

...
spcmky at gmail dot com
14-Oct-2009 05:49
There are issues with most examples of converting a simplexml object into an array recursively.  The situation that fails is when you have a value for an element and attributes.  For example:

<results found="yes">
  <warehouse>
    <name>WH3</name>
    <phone>2-1121</phone>
  </warehouse>
  <items count="3">
    <item id="E1120" bin="AA21">Desk</item>
    <item id="E1121" bin="FG03">Chair</item>
    <item id="E1122" bin="CD00">Table</item>
  </items>
</results>

If you :

<?php
$obj
= simplexml_load_string($xml);
print_r($obj);
?>

You will get:

(
    [@attributes] => Array
        (
            [found] => yes
        )

    [warehouse] => SimpleXMLElement Object
        (
            [name] => WH3
            [phone] => 2-1121
        )

    [items] => SimpleXMLElement Object
        (
            [@attributes] => Array
                (
                    [count] => 3
                )

            [item] => Array
                (
                    [0] => Desk
                    [1] => Chair
                    [2] => Table
                )

        )

)

Where is the rest of the data for the items?  If you were to traverse recursively through the object the item information is in fact there.  The problem is how to represent an element as an array that has a value and attributes.  Most of the solution's just ignore the attributes. 

print_r, var_dump, and get_object_vars ignore the attributes in this special case from what I've found.

Here is a simple function to convert the object into an array but it still fails to deal with the attributes.
<?php
function ToArray ( $data )
{
  if (
is_object($data)) $data = get_object_vars($data);
  return (
is_array($data)) ? array_map(__FUNCTION__,$data) : $data;
}
?>

So why even bother trying to convert the object to an array?  Simply because of serialization for caching the object.

One solution would be to create an index called "value" and assign that the element's value.  This way the attributes could coexist.
walter
12-Jun-2009 02:58
Working fix for the infamous SimpleXML + memcache bug.

Improves code at http://tinyurl.com/bmoon-simplexml to actually work for arbitrary-depth structures.  (Because neither the function nor the json_decode(json_encode($obj)) hack listed there worked for me.)

There's probably some superfluous code in here that could be improved on -- but it works!

<?php
 
# convert a structure that may include objects to a pure
 # array-based structure (that can be stored in memcache)
 #  ... includes support for simplexml!
 # (nb: may have problems with infinite recursive structs)
 
function enforce_array($obj) {
 
$array = (array)$obj;
  if(empty(
$array)) {
  
$array = '';
  }
  else {
   foreach(
$array as $key=>$value) {
    if(!
is_scalar($value)) {
     if(
is_a($value,'SimpleXMLElement')) {
     
$tmp = memcache_objects_to_array($value);
      if(!
is_array($tmp)) {
      
$tmp = ''.$value;
      }
     
$array[$key] = $tmp;
     }
     else {
     
$array[$key] = enforce_array($value);
     }
    }
    else {
    
$array[$key] = $value;
    }
   }
  }
  return
$array;
 }
?>
mail at kleineedv dot de
28-Apr-2009 07:37
I had a problem with simplexml reading nodes from an xml file. It always return an SimpleXML-Object but not the text inside the node.

Example:
<?xml version="1.0" encoding="UTF-8"?>
<Test>
    <Id>123</Id>
</Test>

Reading this xml into a variable called $xml and then doing the following
<?php
$myId
= $xml->Id;
?>
Did not return 123 in $myId, but instead I got a SimpleXMLElement Object.

The solution is simple, when you know it. Use explicit string conversion.
<?php
$myId
= (string)$xml->Id;
?>
oscargodson at gmail dot com
25-Jan-2009 11:05
To add to what others have said, you can't directly put a $_GET or $_POST value into a variable then into an attribute using SimpleXML. You must first convert it to an integer.

This will NOT work

<?php
      $page_id
= $_GET['id'];
      echo
$xml->page[$page_id]
?>

You will get something like:
Notice: Trying to get property of non-object in /Applications/MAMP/htdocs/mysite/index.php on line 10

However, this WILL work and is much simpler then using (string) or other methods.
<?php
   $page_id
= intval($_GET['id']);
   echo
$xml->page[$page_id]
?>
bxt at die-optimisten dot net
26-Nov-2008 03:47
Addition to QLeap's post:
SimpleXML will return a reference to an object containing the node value and you can't use references in session variables as there is no feasible way to restore a reference to another variable.

This won't work too:
$val=$this->xml->node->attributes()->name;
echo $array[$val]; // will cause a warning because of the wrong index type.

You have to convert/cast to a String first:
echo $array[(string)$val];

This will work as expected, because converting will call the __toString() method. Therefor echo works too:
echo $val; // will display the name
QLeap
18-Nov-2008 10:27
Storing SimpleXMLElement values in $_SESSION does not work. Saving the results as an object or individual elements of the object will result in the dreaded "Warning: session_start() [function.session-start]: Node no longer exists" error.

For example, this does not work:

    $xml  = new SimpleXMLElement($page);
    $country  = $xml->Response->Placemark->AddressDetails->Country->CountryNameCode;
    $_SESSION['country'] = $country;

This will work:

    $_SESSION['country'] = (string) $country;
gwhitescarver at yahoo dot com
11-Sep-2008 08:02
Moving some code from a PHP 5.2.6 / Windows environment to a 5.2.0 / Linux environment, I somehow lost access to a plain text node within a SimpleXML Object.  On a var_dump of $xml_node, a [0] element was shown as the string '12'.  However, $xml_node[0] was evaluating NULL in 5.2.0.  You can see below the code change I made, pulling my data out of the raw XML with a regular expression.  Hope this is useful to someone.

//In some versions of PHP it seems we cannot access the [0] element of a SimpleXML Object.  Doesn't work in 5.2.0:
//$count = $xml_node[0];
//grab the raw XML:
$count = ($xml_node->asXML());
//pull out the number between the closing and opening brace of the xml:
$count = preg_replace('/.*>(\d*)<.*/', '$1', $count);
charlie at blankcanvasstudios dot com
14-Aug-2008 06:21
Optimizing aalaap at gmail dot com's php

<?php
function is_rss($feedxml) {
    @
$feed = simplexml_load_string($feedxml);

    return (
$feed->channel->item)?true:false;
}

function
is_atom($feedxml) {
    @
$feed = new SimpleXMLElement($feedxml);
    (
$feed->entry):true:false;
}
?>
aalaap at gmail dot com
30-Jun-2008 01:58
Here are two quick and dirty functions that use SimpleXML to detect if a feed xml is RSS or ATOM:

<?php
function is_rss($feedxml) {
    @
$feed = new SimpleXMLElement($feedxml);

    if (
$feed->channel->item) {
        return
true;
    } else {
        return
false;
    }
}

function
is_atom($feedxml) {
    @
$feed = new SimpleXMLElement($feedxml);

    if (
$feed->entry) {
        return
true;
    } else {
        return
false;
    }
}
?>

The functions take in the full text feed (retrieved via cURL, for example) and return a true or a false based on the result.
 

 
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