Update musicbrainz example

Author: jakejackson1

examples/curl-xml-filter-and-retrival/index.php

@@ -0,0 +1,103 @@
+<?php
+/**
+ * Do an XML lookup from musicbrainz.org and parse/filter the results.
+ *
+ * This example shows how to make a simple REST-style request against a remote
+ * server.
+ *
+ * This does two HTTP requests - one to get information about a band, and another
+ * to get a list of albums put out by that band.
+ *
+ * @author  M Butcher <matt@aleph-null.tv>
+ * @license LGPL The GNU Lesser GPL (LGPL) or an MIT-like license.
+ * @see     https://musicbrainz.org
+ */
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+$artist_name = 'U2';
+$artist_url = 'https://musicbrainz.org/ws/2/artist/?query=' . rawurlencode($artist_name);
+$album_url = 'https://musicbrainz.org/ws/2/release-group?&artist=';
+
+try {
+	/* Make a remote cURL request to get the XML */
+	$artist_xml = get($artist_url);
+
+	/* Load the XML into QueryPath and select the first artist in the list */
+	$artist = qp($artist_xml, 'artist:first');
+
+	/* Check if nothing in the XML matched the selector */
+	if (count($artist) === 0) {
+		echo '<h1>No results found</h1>';
+		exit;
+	}
+
+	/* Get direct children of "artist", filter by the "name" tag, and output the text */
+	echo sprintf('<h1>Albums by <em>%s</em></h1>', $artist->children('name')->text());
+
+	/* Get the unique albums listed for this artist */
+	$id = $artist->attr('id');
+	$album_url .= rawurlencode($id);
+	$albums_xml = get($album_url);
+
+	/* Load the XML into QueryPath */
+	$albums = qp($albums_xml, 'release-group');
+
+	/* Loop over the results */
+	echo '<ol>';
+	foreach ($albums as $album) {
+		echo sprintf(
+			'<li>%1$s (%2$s)</li>',
+			$album->find('title')->text(),
+			$album->find('first-release-date')->text()
+		);
+	}
+	echo '</ol>';
+
+	/* The XML retrieved via cURL and fed into QueryPath */
+	echo '<h2>XML</h2>';
+
+	echo '<h3>Artists</h3>';
+	echo sprintf('<code>%s</code>', $artist_url);
+	echo '<pre><code>';
+	echo htmlspecialchars($artist->top()->xml());
+	echo '</code></pre>';
+
+	echo '<h3>Albums</h3>';
+	echo sprintf('<code>%s</code>', $album_url);
+	echo '<pre><code>';
+	echo htmlspecialchars($albums->top()->xml());
+	echo '</code></pre>';
+
+} catch (Exception $e) {
+	echo $e->getMessage();
+}
+
+/**
+ * Make a GET request using cURL and return the results
+ *
+ * @param string $url
+ * @return string
+ */
+function get($url)
+{
+	$defaults = array(
+		CURLOPT_URL => $url,
+		CURLOPT_HEADER => 0,
+		CURLOPT_RETURNTRANSFER => true,
+		CURLOPT_FAILONERROR => true,
+		CURLOPT_FOLLOWLOCATION => true,
+		CURLOPT_USERAGENT => 'QueryPath/3.0'
+	);
+
+	$ch = curl_init();
+
+	curl_setopt_array($ch, $defaults);
+
+	if (!$result = curl_exec($ch)) {
+		throw new RuntimeException(curl_error($ch));
+	}
+
+	curl_close($ch);
+
+	return $result;
+}