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<title>[116] sites/trunk/wordcamp.org/public_html/wp-content/plugins: WordCamp Canonical Years: Move from private WordCamp repo.</title>
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<dt>Revision</dt> <dd><a href="http://meta.trac.wordpress.org/changeset/116">116</a></dd>
<dt>Author</dt> <dd>iandunn</dd>
<dt>Date</dt> <dd>2013-11-11 22:26:29 +0000 (Mon, 11 Nov 2013)</dd>
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<h3>Log Message</h3>
<pre>WordCamp Canonical Years: Move from private WordCamp repo. See <a href="http://meta.trac.wordpress.org/ticket/221">#221</a>.</pre>
<h3>Added Paths</h3>
<ul>
<li>sites/trunk/wordcamp.org/public_html/wp-content/plugins/wc-canonical-years/</li>
<li><a href="#sitestrunkwordcamporgpublic_htmlwpcontentpluginswccanonicalyearswccanonicalyearsphp">sites/trunk/wordcamp.org/public_html/wp-content/plugins/wc-canonical-years/wc-canonical-years.php</a></li>
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<h3>Diff</h3>
<a id="sitestrunkwordcamporgpublic_htmlwpcontentpluginswccanonicalyearswccanonicalyearsphp"></a>
<div class="addfile"><h4>Added: sites/trunk/wordcamp.org/public_html/wp-content/plugins/wc-canonical-years/wc-canonical-years.php (0 => 116)</h4>
<pre class="diff"><span>
<span class="info">--- sites/trunk/wordcamp.org/public_html/wp-content/plugins/wc-canonical-years/wc-canonical-years.php (rev 0)
+++ sites/trunk/wordcamp.org/public_html/wp-content/plugins/wc-canonical-years/wc-canonical-years.php 2013-11-11 22:26:29 UTC (rev 116)
</span><span class="lines">@@ -0,0 +1,45 @@
</span><ins>+<?php
+/*
+ * Plugin Name: WordCamp.org Canonical Years
+ * Author: Andrew Nacin
+ * Description: Adds a rel="canonical" tag to the front page of WordCamps for previous years pointing to the current year, providing better SEOs.
+ */
+
+class WordCamp_Canonical_Years_Plugin {
+ function __construct() {
+ add_action( 'init', array( $this, 'init' ) );
+ }
+
+ function init() {
+ // Only on the home page.
+ if ( isset( $_SERVER['REQUEST_URI'] ) && $_SERVER['REQUEST_URI'] == '/' )
+ add_action( 'wp_head', array( $this, 'wp_head' ), 9 );
+ }
+
+ /**
+ * Runs during wp_head, prints the canonical link for the most recent
+ * WordCamp in the same city as the current site.
+ */
+ function wp_head() {
+ global $wpdb;
+
+ $matches = array();
+
+ // match xxxx.city.wordcamp.org
+ if ( ! preg_match( '/^([0-9]{4})+\.((.+)\.wordcamp\.(lo|dev|org))$/i', $_SERVER['HTTP_HOST'], $matches ) )
+ return;
+
+ // WordPress will print rel=conanical for singular posts by default, we don't want that.
+ remove_action( 'wp_head', 'rel_canonical' );
+
+ $current_domain = $matches[0];
+ $city_domain = $matches[2];
+
+ $latest_domain = $wpdb->get_var( $wpdb->prepare( "SELECT domain FROM $wpdb->blogs WHERE domain LIKE %s ORDER BY domain DESC LIMIT 1;", "%.{$city_domain}" ) );
+ if ( $latest_domain != $current_domain && $latest_domain )
+ printf( '<link rel="canonical" href="%s" />' . "\n", trailingslashit( esc_url( $latest_domain ) ) );
+ }
+}
+
+// Initialize the plugin.
+new WordCamp_Canonical_Years_Plugin;
</ins><span class="cx">\ No newline at end of file
</span></span></pre>
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