EasyRdf

EasyRdf is a PHP library designed to make it easy to consume and produce RDF. It was designed for use in mixed teams of experienced and inexperienced RDF developers. It is written in Object Oriented PHP and has been tested extensively using PHPUnit.

After parsing EasyRdf builds up a graph of PHP objects that can then be walked around to get the data to be placed on the page. Dump methods are available to inspect what data is available during development.

Data is typically loaded into a EasyRdf_Graph object from source RDF documents, loaded from the web via HTTP. The EasyRdf_GraphStore class simplifies loading and saving data to a SPARQL 1.1 Graph Store.

SPARQL queries can be made over HTTP to a Triplestore using the EasyRdf_Sparql_Client class. SELECT and ASK queries will return an EasyRdf_Sparql_Result object and CONSTRUCT and DESCRIBE queries will return an EasyRdf_Graph object.

Example

$foaf = new EasyRdf_Graph("http://njh.me/foaf.rdf");
$foaf->load();
$me = $foaf->primaryTopic();
echo "My name is: ".$me->get('foaf:name')."\n";

Downloads

The latest stable version of EasyRdf can be downloaded from the EasyRdf website.

Requirements

PHP 5.2.8 or higher

Features

API documentation written in phpdoc
Extensive unit tests written using phpunit
- Automated testing against PHP 5.2, 5.3 and 5.4
Built-in parsers and serialisers: RDF/JSON, N-Triples, RDF/XML, Turtle
Optional parsing support for: ARC2, Redland Bindings, rapper
Optional support for Zend_Http_Client
No required external dependancies upon other libraries (PEAR, Zend, etc...)
Complies with Zend Framework coding style.
Type mapper - resources of type foaf:Person can be mapped into PHP object of class Foaf_Person
Support for visualisation of graphs using GraphViz
Comes with a number of examples

More Examples

artistinfo.php - Example of mapping an RDF class type to a PHP Class
basic.php - Basic "Hello World" type example
basic_sparql.php - Example of making a SPARQL SELECT query
converter.php - Convert RDF from one format to another
dump.php - Display the contents of a graph
foafinfo.php - Display the basic information in a FOAF document
foafmaker.php - Construct a FOAF document with a choice of serialisations
graph_direct.php - Example of using EasyRdf_Graph directly without EasyRdf_Resource
graphstore.php - Store and retrieve data from a SPARQL 1.1 Graph Store
graphviz.php - GraphViz rendering example
html_tag_helpers.php - Rails Style html tag helpers to make the EasyRdf examples simplier
httpget.php - No RDF, just test EasyRdf_Http_Client
serialise.php - Basic serialisation example
sparql_queryform.php - Form to submit SPARQL queries and display the result
uk_postcode.php - Example of resolving UK postcodes using uk-postcodes.com
villages.php - Fetch and information about villages in Fife from dbpedialite.org
zend_framework.php - Example of using Zend_Http_Client and Zend_Loader_Autoloader with EasyRdf

Contributing to EasyRdf

Contributions to the EasyRdf codebase are welcome using the usual Github pull request workflow. To run the code style checker:

make cs

You can run the PHP unit test suite with:

make test

Licensing

The EasyRdf library and tests are licensed under the BSD-3-Clause license. The examples are in the public domain, for more information see UNLICENSE.

scor/easyrdf