PHP. Руководство по PHP. 2005


<?php
$xmlstr = <<<XML
<?xml version='1.0' standalone='yes'?>
<movies>
<movie>
<title>PHP: Behind the Parser</title>
<characters>
<character>
<name>Ms. Coder</name>
<actor>Onlivia Actora</actor>
</character>
<character>
<name>Mr. Coder</name>
<actor>El Act&#211;r</actor>
</character>
</characters>
<plot>
So, this language. It's like, a programming language. Or is it a
scripting language? All is revealed in this thrilling horror spoof
of a documentary.
</plot>
<rating type="thumbs">7</rating>
<rating type="stars">5</rating>
</movie>
</movies>
XML;
?>

The simplicity of SimpleXML appears most clearly when one extracts

a string or number from a basic XML document.

Пример 2. Getting <plot>


<?php
include 'example.php';

$xml = simplexml_load_string($xmlstr);

echo $xml->movie[0]->plot; // "So this language. It's like..."
?>

Пример 3. Accessing non-unique elements in SimpleXML

When multiple instances of an element exist as children of

a single parent element, normal iteration techniques apply.


<?php
include 'example.php';

$xml = simplexml_load_string($xmlstr);

/* For each <movie> node, we echo a separate <plot>. */
foreach ($xml->movie as $movie){
echo $movie->plot, '<br>';
}

?>

Пример 4. Using attributes

So far, we have only covered the work of reading element names

and their values. SimpleXML can also access element attributes.

Access attributes of an element just as you would elements

of an array.


<?php
include 'example.php';

$xml = simplexml_load_string($xmlstr);

/* Access the <rating> nodes of the first movie.
* Output the rating scale, too. */
foreach ($xml->movie[0]->rating as $rating){
switch((string) $rating['type']){ // Get attributes as element indices
case 'thumbs':
echo $rating, ' thumbs up';
break;
case 'stars':
echo $rating, ' stars';
break;
}
}
?>

Пример 5. Comparing Elements and Attributes with Text

To compare an element or attribute with a string or pass it into a

function that requires a string, you must cast it to a string using

(string). Otherwise, PHP treats the element as an object.


<?php
include 'example.php';

$xml = simplexml_load_string($xmlstr);

if ((string) $xml->movie->title == 'PHP: Behind the Parser'){
print 'My favorite movie.';
}

htmlentities((string) $xml->movie->title);
?>

Пример 6. Using Xpath

SimpleXML includes builtin Xpath support.

To find all <character> elements:


<?php
include 'example.php';
$xml = simplexml_load_string($xmlstr);

foreach ($xml->xpath('//character') as $character){
echo $character->name, 'played by ', $character->actor, '<br>';
}
?>

'//' serves as a wildcard. To specify absolute

paths, omit one of the slashes.

Пример 7. Setting values

Data in SimpleXML doesn't have to be constant. The object allows

for manipulation of all of its elements.


<?php
include 'example.php';
$xml = simplexml_load_string($xmlstr);

$xml->movie[0]->characters->character[0]->name = 'Miss Coder';

echo $xml->asXML();
?>

The above code will output a new XML document, just like the original,

except that the new XML will change Ms. Coder to Miss Coder.

Пример 8. DOM Interoperability

PHP has a mechanism to convert XML nodes between SimpleXML

and DOM formats. This example shows how one might change

a DOM element to SimpleXML.


<?php
$dom = new domDocument;
$dom->loadXML('<books><book><title>blah</title></book></books>');
if (!$dom){
echo 'Error while parsing the document';
exit;
}

$s = simplexml_import_dom($dom);

echo $s->book[0]->title;
?>

Содержание
SimpleXMLElement->asXML -- Return a well-formed XML string based on SimpleXML element
SimpleXMLElement->attributes -- Identifies an element's attributes
SimpleXMLElement->children -- Finds children of given node
SimpleXMLElement->xpath -- Runs Xpath query on XML data
simplexml_import_dom -- Get a SimpleXMLElement object from a DOM node.
simplexml_load_file -- Interprets an XML file into an object
simplexml_load_string -- Interprets a string of XML into an object

shmop_write

SimpleXMLElement->asXML

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

⇪