SimpleXMLElement->attributes

Description

SimpleXMLElement simplexml_element->attributes ( [string data] )

This function provides the attributes and values defined within an xml tag.

注: SimpleXML 创建了一条给大部分方法增加交互式属性的规则。这些属性不能够使用 var_dump() 或其它检查对象的方法来查看。

例子 1. Interpret an XML string
<?php $string = <<<XML <a> <foo name="one" game="lonely">1</foo> </a> XML; $xml = simplexml_load_string($string); foreach($xml->foo[0]->attributes() as $a => $b) { echo $a,'="',$b,"\"\n"; } ?>
This script will display:
name="one" game="lonely"

add a note User Contributed Notes

skerr at mojavi dot org
10-Dec-2004 02:55


You can also access the node as an array to get attributes:



<?php



$xml = simplexml_load_file('file.xml');



echo 'Attribute: ' . $xml['attribute'];



?>

christian at koch dot net
09-Nov-2004 04:35


PHP5:: I think this is a fine solution to get the attributes easier...



<?php



class EFXMLElement extends SimpleXMLElement {



    function attributes() {

       return new EFXMLAttributes(parent::attributes());

    }



}



class EFXMLAttributes {



    private $attributes;



    function __construct($attributes) {

        $this->attributes = $attributes;

    }



    function __get($name) {

        if (isset($this->attributes[$name])) {

            return $this->attributes[$name];

        } else {

            return false;

        }

    }



}



if (file_exists('pref.xml')) {

    $tst = new EFXMLElement(file_get_contents('pref.xml'));

    var_dump($tst->plugins->plugin[0]->attributes()->name);

} else {

    exit('Failed to open test.xml.');

}



?>

XML::example



<?xml version="1.0" encoding="ISO8859-1" ?>

<preferences>

    <system>

        EF3

    </system>

    <websites>

        <website name="demo">

            <scriptpath>/</scriptpath>

        </website>

        <website name="other">

            x    

        </website>

    </websites>

    <plugins>

        <plugin type="single" name="content" ontemplate="yes">

            <tag><![CDATA[<%content%>]]></tag>

            <class>EFContentPlugin</class>

            <source>/ef3/plugins/EFContentPlugin.class</source>

        </plugin>

        <plugin type="single" name="attribute" ontemplate="no">

            <tag><![CDATA[<%attribute @%>]]></tag>

            <class>EFAttributePlugin</class>

            <source>/ef3/plugins/EFAttributePlugin.class</source>

        </plugin>

        <plugin type="single" name="component" ontemplate="no">

            <tag><![CDATA[<%component @%>]]></tag>

            <class>EFComponentPlugin</class>

            <source>/ef3/plugins/EFComponentPlugin.class</source>

        </plugin>

        <plugin type="double" name="klammer" ontemplate="no">

            <tag><![CDATA[<KLAMMER@>]]></tag>

            <closer><![CDATA[<KLAMMER@>]]></closer>

            <class>KlammerPlugin</class>

            <source>/ef3/plugins/KlammerPlugin.class</source>

        </plugin>

    </plugins>

</preferences>

sveta at microbecal dot com
30-Oct-2004 06:03


Namespace handling example:

------------------------------------

test.xml:

<?xml version="1.0"?>

<Workbook xmlns="http://url1" xmlns:ss="http://url2">

 <Worksheet ss:Name="English">

 </Worksheet>

</Workbook>

script.php:

$xml_file = 'test.xml';

$xml = simplexml_load_file($xml_file);

foreach($xml->Worksheet->attributes('http://url2')

as $a => $b) {

    echo $a,'="',$b,"\"\n";

}

tychay at php dot net
29-Sep-2004 01:04


BTW, It occurs to me that why do you need the function anyway? You just access it directly as (string) $object[$attribute].

tychay at php dot net
29-Sep-2004 07:31


Why bother iterating over all the elements when they are already indexed? something like...



function simplexml_find_attribute(SimpleXMLElement $element, $attributeName) {

    $attrs = $element->attributes();

    if (isset($attrs[$attributeName])) {

        return (string) $attrs[$attributeName];

    }

    return false;

}



- terry

Eirik Sletteberg
12-Sep-2004 09:21


In reply to inge at elektronaut dot no's function:

Notice that this function returns an object, and not

a string. This is quite hard to notice at first, because

if you validate the return against a string, it will return

true:

print findAttribute($Fox, "foo") == "bar"? "Matches.":"Won't match."; // "Matches."



But, if you attempt to use the return for indexing in an array, like:

$MyArray[findattribute($Fox, "foo")] = "bar";



You will get an illegal offset type-error.

------

To correct this, we force-cast the return as a string:



function findAttribute($object, $attribute) {

  foreach($object->attributes() as $a => $b) {

   if ($a == $attribute) {

     $return = $b;

   }

  }

  if($return) {

   return (string)$return;

  }

}

inge at elektronaut dot no
27-May-2004 01:53


here's a simple function to get an attribute by name, based on the example



<?php

function findAttribute($object, $attribute) {

  foreach($object->attributes() as $a => $b) {

    if ($a == $attribute) {

      $return = $b;

    }

  } 

  if($return) {

    return $return;

  }

}

?>

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