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Example code of pear/xml_xrd

Informations about the package xml_xrd

XML_XRD

PHP library to parse and generate Extensible Resource Descriptor (XRD) Version 1.0 files. It supports loading and saving XML (XRD) and JSON (JRD) markup.

XRD and JRD files are used for .well-known/host-meta files as standardized in RFC 6415: Web Host Metadata.

Webfinger, based on JRD, can be used to discover information about users by just their e-mail address, e.g. their OpenID provider URL.

The XRD format supercedes the XRDS format defined in XRI 2.0, which is used in the Yadis communications protocol.

Examples

Loading XRD files

Load from file

<XRD>
 ...
XRD;

require_once 'XML/XRD.php';
$xrd = new XML_XRD();
try {
    $xrd->loadString($myxrd, 'xml');
} catch (XML_XRD_Exception $e) {
    die('Loading XRD string failed: '  . $e->getMessage());
}

Verification

Verify subject

Check if the XRD file really describes the resource/URL that we requested the XRD for:

If you want a JSON file for JRD:

echo $x->to('json');

Webfinger file

Error handling

When loading a file, exceptions of type XML_XRD_Exception may be thrown. All other parts of the code do not throw exceptions but fail gracefully by returning null, e.g. when a property does not exist.

Using loadFile() may result in PHP warnings like:

Warning: simplexml_load_file(https://example.org/) failed to open stream: Connection refused

This cannot be prevented properly, so you either have to silence it with @ or fetch the file manually and use loadString().

TODO

Links

All versions of xml_xrd with dependencies

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