Minimal example for parsing planetdam.org RDF/XML using EasyRDF

planetdam_easyrdf_demo.php

<?php

/*
    Minimal example for parsing http://planetdam.org article list RDF/XML
    using http://www.easyrdf.org
    
    1) Install Composer, see http://www.easyrdf.org/docs/getting-started :
    
      curl -s https://getcomposer.org/installer | php
    
    2) Create composer.json:
    
    {
        "require": {
            "easyrdf/easyrdf": "*"
        }
    }
    
    3) Install EasyRDF:
    
      php composer.phar install
      
    4) Run this file from the command line:
    
      php planetdam_easyrdf_demo.php 
    
*/

if (PHP_SAPI === 'cli')
{
    error_reporting(E_ALL);
    ini_set('error_log', false);
    ini_set('display_errors', 'stderr');
}

require 'vendor/autoload.php';

$graph = EasyRdf_Graph::newAndLoad('http://planetdam.org/api/article');

$items = $graph->allOfType('schema:CreativeWork');

foreach ($items as $item)
{
    echo "Item URL: " . $item->getUri() . "\n";
    
    $name = $item->getLiteral('schema:name');
    
    if ($name)
    {
        echo "Name: " . $name->getValue() . "\n";
    }

    $thumbnail = $item->getResource('schema:thumbnail');
    
    if ($thumbnail)
    {
        $thumbnail_url = $thumbnail->get('schema:contentUrl');
        
        if ($thumbnail_url)
            echo "Thumbnail URL: " . $thumbnail_url->getValue() . "\n";
    }
    
    echo "\n";
}