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<?php
/*
Plugin Name: Taxonomy Metadata
Description: Infrastructure plugin which implements metadata functionality for taxonomy terms, including for tags and categories.
Version: 0.4
Author: mitcho (Michael Yoshitaka Erlewine), sirzooro
Author URI: http://mitcho.com/
*/

class Taxonomy_Metadata {
	function __construct() {
		add_action( 'init', array($this, 'wpdbfix') );
		add_action( 'switch_blog', array($this, 'wpdbfix') );
		add_action('wpmu_new_blog', array($this, 'new_blog'), 10, 6);
	}

/*
	 * Quick touchup to wpdb
	 */
	function wpdbfix() {
		global $wpdb;
		$wpdb->taxonomymeta = "{$wpdb->prefix}taxonomymeta";
	}
	
	/*
	 * TABLE MANAGEMENT
	 */

function new_blog( $blog_id, $user_id, $domain, $path, $site_id, $meta ) {
		if ( is_plugin_active_for_network(plugin_basename(__FILE__)) )
			$this->setup_blog($blog_id);
	}
}
$taxonomy_metadata = new Taxonomy_Metadata;
//register_activation_hook( __FILE__, array($taxonomy_metadata, 'activate') );

add_action('init', array($taxonomy_metadata, 'activate'));

// THE REST OF THIS CODE IS FROM http://core.trac.wordpress.org/ticket/10142
// BY sirzooro

//
// Taxonomy meta functions
//

/**
 * Add meta data field to a term.
 *
 * @param int $term_id Post ID.
 * @param string $key Metadata name.
 * @param mixed $value Metadata value.
 * @param bool $unique Optional, default is false. Whether the same key should not be added.
 * @return bool False for failure. True for success.
 */
function et_add_term_meta($term_id, $meta_key, $meta_value, $unique = false) {
	return add_metadata('taxonomy', $term_id, $meta_key, $meta_value, $unique);
}

/**
 * Remove metadata matching criteria from a term.
 *
 * You can match based on the key, or key and value. Removing based on key and
 * value, will keep from removing duplicate metadata with the same key. It also
 * allows removing all metadata matching key, if needed.
 *
 * @param int $term_id term ID
 * @param string $meta_key Metadata name.
 * @param mixed $meta_value Optional. Metadata value.
 * @return bool False for failure. True for success.
 */
function et_delete_term_meta($term_id, $meta_key, $meta_value = '') {
	return delete_metadata('taxonomy', $term_id, $meta_key, $meta_value);
}

/**
 * Retrieve term meta field for a term.
 *
 * @param int $term_id Term ID.
 * @param string $key The meta key to retrieve.
 * @param bool $single Whether to return a single value.
 * @return mixed Will be an array if $single is false. Will be value of meta data field if $single
 *  is true.
 */
function et_get_term_meta($term_id, $key, $single = false) {
	return get_metadata('taxonomy', $term_id, $key, $single);
}

/**
 * Update term meta field based on term ID.
 *
 * Use the $prev_value parameter to differentiate between meta fields with the
 * same key and term ID.
 *
 * If the meta field for the term does not exist, it will be added.
 *
 * @param int $term_id Term ID.
 * @param string $key Metadata key.
 * @param mixed $value Metadata value.
 * @param mixed $prev_value Optional. Previous value to check before removing.
 * @return bool False on failure, true if success.
 */
function et_update_term_meta($term_id, $meta_key, $meta_value, $prev_value = '') {
	return update_metadata('taxonomy', $term_id, $meta_key, $meta_value, $prev_value);
}

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