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Basic SimpleXML usage. Many examples in this reference require an XML string. Instead of repeating this string in every example, we put it into a file which we include in each example. I have a URL with an XML file. How can I copy the whole code to a file with PHP? I am using SimpleXML but I haven't understood how to do this yet. How to use PHP and the Content-disposition HTTP header to force files to download that would normally open in the web browser and display inline.
Basic SimpleXML usage
Many examples in this reference require an XML string. Instead of repeating this string in every example, we put it into a file which we include in each example. This included file is shown in the following example section. Alternatively, you could create an XML document and read it with simplexml_load_file().
Example #1 Include file example.php with XML string
<?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 ActÓr</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>
<great-lines>
<line>PHP solves all my web problems</line>
</great-lines>
<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.
Example #2 Getting <plot>
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<?php
include 'example.php';
$movies = new SimpleXMLElement($xmlstr);
echo $movies->movie[0]->plot;
?>Accessing elements within an XML document that contain characters not permitted under PHP's naming convention (e.g. the hyphen) can be accomplished by encapsulating the element name within braces and the apostrophe.
Example #3 Getting <line>
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<?php
include 'example.php';
$movies = new SimpleXMLElement($xmlstr);
echo $movies->movie->{'great-lines'}->line;
?>
Example #4 Accessing non-unique elements in SimpleXML
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<?php
include 'example.php';
$movies = new SimpleXMLElement($xmlstr);
/* For each <character> node, we echo a separate <name>. */
foreach ($movies->movie->characters->character as $character) {
echo $character->name, ' played by ', $character->actor, PHP_EOL;
}
?>Note:
Properties ($movies->movie in previous example) are not arrays. They are iterable and accessible objects.
Example #5 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.
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<?php
include 'example.php';
$movies = new SimpleXMLElement($xmlstr);
/* Access the <rating> nodes of the first movie.
* Output the rating scale, too. */
foreach ($movies->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;
}
}
?>Example #6 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';
$movies = new SimpleXMLElement($xmlstr);
if ((string) $movies->movie->title 'PHP: Behind the Parser') {
print 'My favorite movie.';
}
echo htmlentities((string) $movies->movie->title);
?>Example #7 Comparing Two Elements
Two SimpleXMLElements are considered different even if they point to the same element since PHP 5.2.0.
<?php
include 'example.php';
$movies1 = new SimpleXMLElement($xmlstr);
$movies2 = new SimpleXMLElement($xmlstr);
var_dump($movies1 $movies2); // false since PHP 5.2.0
?>Example #8 Using XPath
SimpleXML includes built-in XPath support. To find all <character> elements:
<?php
include 'example.php';
$movies = new SimpleXMLElement($xmlstr);
foreach ($movies->xpath('//character') as $character) {
echo $character->name, ' played by ', $character->actor, PHP_EOL;
}
?>'//' serves as a wildcard. To specify absolute paths, omit one of the slashes.
Example #9 Setting values
Data in SimpleXML doesn't have to be constant. The object allows for manipulation of all of its elements.
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<?php
include 'example.php';
$movies = new SimpleXMLElement($xmlstr);
$movies->movie[0]->characters->character[0]->name = 'Miss Coder';
echo $movies->asXML();
?>Example #10 Adding elements and attributes
Free dwg viewer mac download. Since PHP 5.1.3, SimpleXML has had the ability to easily add children and attributes.
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<?php
include 'example.php';
$movies = new SimpleXMLElement($xmlstr);
$character = $movies->movie[0]->characters->addChild('character');
$character->addChild('name', 'Mr. Parser');
$character->addChild('actor', 'John Doe');
$rating = $movies->movie[0]->addChild('rating', 'PG');
$rating->addAttribute('type', 'mpaa');
echo $movies->asXML();
?>Example #11 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.
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<?php
$dom = new DOMDocument;
$dom->loadXML('<books><book><title>blah</title></book></books>');
if (!$dom) {
echo 'Error while parsing the document';
exit;
}
$books = simplexml_import_dom($dom);
echo $books->book[0]->title;
?>