简介

The SimpleXML extension provides a very simple and easily usable toolset to convert XML to an object that can be processed with normal property selectors and array iterators.

需求

The SimpleXML extension requires PHP 5.

安装

The SimpleXML extension is enabled by default. To disable it, use the --disable-simplexml configure option.

范例

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().

例子 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 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.

例子 2. Getting <plot> <?php include 'example.php'; $xml = simplexml_load_string($xmlstr); echo $xml->movie[0]->plot; // "So this language. It's like..." ?>

例子 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 />'; } ?>

例子 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;     } } ?>

例子 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); ?>

例子 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.

例子 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.

例子 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; ?>