<?php

/*
Plugin Name: 404 Notifier 
Plugin URI: http://crowdfavorite.com/wordpress/plugins/404-notifier/ 
Description: This plugin will log 404 hits on your site and can notify you via e-mail or you can subscribe to the generated RSS feed of 404 events.
Version: 1.3
Author: Crowd Favorite
Author URI: http://crowdfavorite.com
*/

// Copyright (c) 2007-2010 
//   Crowd Favorite, Ltd. - http://crowdfavorite.com
//   Alex King - http://alexking.org
// All rights reserved.
//
// Released under the GPL license
// http://www.opensource.org/licenses/gpl-license.php
//
// This is an add-on for WordPress - http://wordpress.org
//
// **********************************************************************
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
// **********************************************************************

// ini_set('display_errors', '1'); ini_set('error_reporting', E_ALL);

define('N404_Version', '1.3');

load_plugin_textdomain('404-notifier');

if (is_file(trailingslashit(WP_PLUGIN_DIR).'404-notifier.php')) {
	define('N404_FILE', trailingslashit(WP_PLUGIN_DIR).'404-notifier.php');
	define('N404_RELATIVE_FILE', '404-notifier.php');
}
else if (is_file(trailingslashit(WP_PLUGIN_DIR).'404-notifier/404-notifier.php')) {
	define('N404_FILE', trailingslashit(WP_PLUGIN_DIR).'404-notifier/404-notifier.php');
	define('N404_RELATIVE_FILE', '404-notifier/404-notifier.php');
}

define('CF_ADMIN_DIR', '404-notifier/cf-admin/'); 
require_once('cf-admin/cf-admin.php');

$_SERVER['REQUEST_URI'] = ( isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : $_SERVER['SCRIPT_NAME'].(( isset($_SERVER['QUERY_STRING']) ? '?'.$_SERVER['QUERY_STRING'] : '')));
class ak_404 {
	var $url_404;
	var $url_refer;
	var $remote_addr;
	var $remote_host;
	var $user_agent;
	var $mailto;
	var $mail_enabled;
	var $rss_limit;
	var $date;
	var $options;
	
	function ak_404() {
		global $wpdb;
		if (!isset($wpdb->ak_404_log)) {
			$wpdb->ak_404_log = $wpdb->prefix.'ak_404_log';
		}
		$this->url_404 = isset($_SERVER['REQUEST_URI']) ? 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'] : '';
		$this->url_refer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '';
		$this->remote_addr = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '';
		$this->remote_host = isset($_SERVER['REMOTE_HOST']) ? $_SERVER['REMOTE_HOST'] : '';
		$this->user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
		$this->mailto = '';
		$this->mail_enabled = 0;
		$this->rss_limit = 100;
		$this->date = gmdate('Y-m-d H:i:s');
		$this->options = array(
			'mailto' => 'email',
			'mail_enabled' => 'int',
			'rss_limit' => 'int'
		);
	}

	function install() {
		global $wpdb;
		$result = $wpdb->query("
			CREATE TABLE `$wpdb->ak_404_log` (
			`id` INT( 11 ) NOT NULL AUTO_INCREMENT PRIMARY KEY ,
			`url_404` TEXT NOT NULL ,
			`url_refer` TEXT NULL ,
			`remote_addr` VARCHAR(255) NULL ,
			`remote_host` TEXT NULL ,
			`user_agent` TEXT NULL ,
			`date_gmt` DATETIME NOT NULL
			)
		");
		add_option('ak404_mailto', $this->mailto);
		add_option('ak404_mail_enabled', $this->mail_enabled);
		add_option('ak404_rss_limit', $this->rss_limit);
	}

	function upgrade() {
		global $wpdb;
		$col_data = $wpdb->get_results("
			SHOW COLUMNS FROM $wpdb->ak_404_log
		");
		$cols = array();
		foreach ($col_data as $col) {
			$cols[] = $col->Field;
		}
		// 1.3 schema upgrade
		if (!in_array('remote_addr', $cols)) {
			$wpdb->query("
				ALTER TABLE `$wpdb->ak_404_log`
				ADD `remote_addr` VARCHAR(255) DEFAULT NULL
				AFTER `url_refer`
			");
		}
		if (!in_array('remote_host', $cols)) {
			$wpdb->query("
				ALTER TABLE `$wpdb->ak_404_log`
				ADD `remote_host` VARCHAR(255) DEFAULT NULL
				AFTER `remote_addr`
			");
		}
	}

	function update_settings() {
		if (!current_user_can('manage_options')) {
			return;
		}
		$options_arr = array();
		foreach ($this->options as $option => $type) {
			if (isset($_POST[$option])) {
				switch ($type) {
					case 'email':
						$value = stripslashes($_POST[$option]);
						if (!ak_check_email_address($value)) {
							$value = '';
						}
						break;
					case 'int':
						$value = intval($_POST[$option]);
						break;
					default:
						$value = stripslashes($_POST[$option]);
				}
				$options_arr['ak404_'.$option] .= $value;
			}
			else {
				$options_arr['ak404_'.$option] .= $this->options;				
			}
		}
		update_option('ak404_options', serialize($options_arr));
		$this->upgrade();
	}

	function get_settings() {
		$settings = unserialize(get_option('ak404_options'));
		foreach ($this->options as $option => $type) {
			if (empty($settings)) {
				$this->$option = get_option('ak404_'.$option);
			}
			else {
				$this->$option = $settings['ak404_'.$option];
			}
			switch ($type) {
				case 'email':
					$this->$option = $this->$option;
					break;
				case 'int':
					$this->$option = intval($this->$option);
					break;
			}
		}
	}
	
	function log_404() {
		global $wpdb;
		if (empty($this->url_404)) {
			return;
		}
		$result = $wpdb->insert(
			$wpdb->ak_404_log,
			array(
				'url_404' => $this->url_404,
				'url_refer' => $this->url_refer,
				'remote_addr' => $this->remote_addr,
				'remote_host' => $this->remote_host,
				'user_agent' => $this->user_agent,
				'date_gmt' => $this->date
			)			
		);
		if ($result === false) {
			return false;
		}
		$this->mail_404();
	}
	
	function surpress_notification($regexs = array()) {
		$regexs = apply_filters('ak404_surpress_notification', $regexs);
		if (count($regexs)) {
			foreach ($regexes as $regex) {
				if (preg_match($regex, $this->url_404)) {
					return true;
				}
			}
		}
		return false;
	}

	function mail_404() {
		if (!empty($this->mailto) && $this->mail_enabled){//} && !$this->surpress_notification()) {
			$to      = esc_html($this->mailto);
			$subject = __('404: ', '404-notifier').esc_html($this->url_404);
			$message = __('404 Report - a file not found error was registered on your site.', '404-notifier')."\n\n"
				.__('404 URL:     ', '404-notifier').esc_html($this->url_404)."\n\n"
				.__('Referred by: ', '404-notifier').esc_html($this->url_refer)."\n\n"
				.__('Remote Address: ', '404-notifier').esc_html($this->remote_addr)."\n\n"
				.__('Remote Host: ', '404-notifier').esc_html($this->remote_host)."\n\n"
				.__('User Agent: ', '404-notifier').esc_html($this->user_agent)."\n\n"
				.__('Time: ', '404-notifier').esc_html(mysql2date('Y-m-d H:i:s', $this->date))."\n\n";
			$headers = 'From: '.esc_html($this->mailto)."\r\n"
				.'Reply-To: '.esc_html($this->mailto)."\r\n"
				.'X-Mailer: PHP/'.phpversion();
			
			wp_mail($to, $subject, $message, $headers);
		}
	}
	
	function dashboard_page() {
		global $wpdb;
		echo('
<div id="cf" class="wrap">
	<div id="cf-header">
		');
		CF_Admin::admin_header(__('404 Notifier Logs', '404-notifier'),'404-Notifier', N404_Version, '404-notifier');
		echo('
	</div> <!--#cf-header-->
		');

		$per_page = 20;
		$pagenum = isset($_GET['paged']) ? absint($_GET['paged']) : 0;
		if (empty($pagenum)) $pagenum = 1;
		$offset = ($pagenum - 1) * $per_page;
		$events = $wpdb->get_results("
			SELECT SQL_CALC_FOUND_ROWS *
			FROM $wpdb->ak_404_log
			ORDER BY date_gmt DESC
			LIMIT $offset, $per_page
		");
		$overall_count = $wpdb->get_var("SELECT FOUND_ROWS()");
		if ($overall_count > 0) {
			$num_pages = ceil($overall_count / $per_page);
			$page_links = paginate_links(array(
				'base' => add_query_arg('paged', '%#%'),
				'format' => '',
				'prev_text' => __('&laquo;'),
				'next_text' => __('&raquo;'),
				'total' => $num_pages,
				'current' => $pagenum
			));
			if ($page_links) {
				echo '<div class="tablenav"><div class="tablenav-pages">';
				$page_links_text = sprintf('<span class="displaying-num">'.__('Displaying %s&#8211;%s of %s', '404-notifier').'</span>%s',
					number_format_i18n(($pagenum-1) * $per_page+1),
					number_format_i18n(min($pagenum * $per_page, $overall_count)),
					number_format_i18n($overall_count),
					$page_links
				);
				echo $page_links_text.'</div><div class="clear"></div></div>';
			}

			echo('
	<table class="widefat post fixed" cellspacing="0">
		<thead>
			<tr>
				<th scope="col" id="url" class="manage-column column-url">'.__('404 URL', '404-notifier').'</th>
				<th scope="col" id="refer" class="manage-column column-refer">'.__('Referring URL', '404-notifier').'</th>
				<th scope="col" id="address" class="manage-column column-address">'.__('Remote Address', '404-notifier').'</th>
				<th scope="col" id="host" class="manage-column column-host">'.__('Remote Host', '404-notifier').'</th>
				<th scope="col" id="agent" class="manage-column column-agent">'.__('User Agent', '404-notifier').'</th>
				<th scope="col" id="date" class="manage-column column-date">'.__('Date', '404-notifier').'</th>
			</tr>
		</thead>

		<tfoot>
			<tr>
				<th scope="col" class="manage-column column-url">'.__('404 URL', '404-notifier').'</th>
				<th scope="col" class="manage-column column-refer">'.__('Referring URL', '404-notifier').'</th>
				<th scope="col" class="manage-column column-address">'.__('Remote Address', '404-notifier').'</th>
				<th scope="col" class="manage-column column-host">'.__('Remote Host', '404-notifier').'</th>
				<th scope="col" class="manage-column column-agent">'.__('User Agent', '404-notifier').'</th>
				<th scope="col" class="manage-column column-date">'.__('Date', '404-notifier').'</th>
			</tr>
		</tfoot>

		<tbody>
			');
			$rowclass = ' class="alternate"';
			foreach ($events as $event) {
				$rowclass = ' class="alternate"' == $rowclass ? '' : ' class="alternate"';
				echo('
			<tr id="'.esc_attr('log-'.$event->id).'"'.$rowclass.' valign="top">
				<td class="url column-url"><strong><a href="'.esc_url($event->url_404).'">'.esc_html($event->url_404).'</a></strong></td>
				<td class="refer column-refer">'.(isset($event->url_refer) && !empty($event->url_refer) ? '<a href="'.esc_url($event->url_refer).'">'.esc_html($event->url_refer).'</a>' : '<span class="nonessential">'.__('N/A', '404-notifier').'</span>').'</td>
				<td class="address column-address">'.(isset($event->remote_addr) && !empty($event->remote_addr) ? esc_html($event->remote_addr) : '<span class="nonessential">'.__('N/A', '404-notifier').'</span>').'</td>
				<td class="host column-host">'.(isset($event->remote_host) && !empty($event->remote_host) ? esc_html($event->remote_host) : '<span class="nonessential">'.__('N/A', '404-notifier').'</span>').'</td>
				<td class="agent column-agent">'.(isset($event->user_agent) && !empty($event->user_agent) ? esc_html($event->user_agent) : '<span class="nonessential">'.__('N/A', '404-notifier').'</span>').'</td>
				<td class="date column-date">'.esc_html(mysql2date('D, d M Y H:i:s', $event->date_gmt, false)).'</td>
			</tr>
				');
			}
			echo('
		</tbody>
	</table>
			');

			if ($page_links) {
				echo '<div class="tablenav"><div class="tablenav-pages">'.$page_links_text.'</div><div class="clear"></div></div>';
			}
		} // $overall_count > 0
		else {
			echo '<p><em>'.__('No logs to display&hellip;', '404-notifier').'</em></p>';
		}

		echo '</div>';
		CF_Admin::callouts('404-notifier');
	}

	function options_form() {
		echo('
<div id="cf" class="wrap">
	<div id="cf-header">
		');
		CF_Admin::admin_header(__('404 Notifier Options', '404-notifier'), '404-Notifier', N404_Version, '404-notifier');
		echo('
	</div>
	<form name="ak_404" action="'.admin_url('options-general.php').'" method="post" class="cf-form">
		<fieldset class="cf-lbl-pos-left" >
			<div class="cf-elm-block elm-width-300">
				<label for="mailto" class="cf-lbl-text">'.__('E-mail address to notify:', '404-notifier').'</label>
				<input type="text" class="cf-elm-text" name="mailto" id="mailto" value="'.esc_html($this->mailto).'"  />
			</div>
			<div class="cf-elm-block cf-has-checkbox">
				<input type="checkbox" name="mail_enabled" id="ak404_mail_enabled" value="1" class="cf-elm-checkbox"'.checked($this->mail_enabled, '1', false).'/>
				<label for="ak404_mail_enabled" class="cf-lbl-checkbox">'.__('Enable mail notifications on 404 hits.', '404-notifier').'</label>
			</div>
			<div class="cf-elm-block cf-elm-width-50">
				<label for="rss_limit" class="cf-lbl-text">'.__('Limit the RSS Feed to how many items?', '404-notifier').'</label>
				<input type="text" name="rss_limit" id="rss_limit" class="cf-elm-text" value="'.esc_html(intval($this->rss_limit)).'" />
			</div>
			<div class="cf-elm-block cf-elm-width-300">
				<a href="'.site_url('?ak_action=404_feed').'">'.__('RSS Feed of 404 Events', '404-notifier').'</a>
			</div>
			<input type="hidden" name="ak_action" value="update_404_settings"/>
		</fieldset>
		<p class="submit">
			<input type="submit" name="submit" value="'.__('Update 404 Notifier Settings', '404-notifier').'"  class="button-primary" />
			'.wp_nonce_field('404-notifier', '_wpnonce', true, false).'
			'.wp_referer_field(false).'
		</p>
	</form>
		');
	
		CF_Admin::callouts('404-notifier');
		echo('
</div> <!--#cf-->
		');
	}
	
	function rss_feed() {
		global $wpdb;
		$events = $wpdb->get_results("
			SELECT *
			FROM $wpdb->ak_404_log
			ORDER BY date_gmt DESC
			LIMIT $this->rss_limit
		");
		header('Content-type: text/xml; charset='.get_option('blog_charset'), true);
		echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>';
?>
<rss version="2.0" 
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
>

<channel>
	<title><?php _e('404 Report for: ', '404-notifier'); bloginfo_rss('name'); ?></title>
	<link><?php bloginfo_rss('url') ?></link>
	<description><?php bloginfo_rss("description") ?></description>
	<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_lastpostmodified('GMT'), false); ?></pubDate>
	<generator><?php echo esc_url('http://wordpress.org/?v='.bloginfo_rss('version')); ?></generator>
	<language><?php echo get_option('rss_language'); ?></language>
<?php
		if (count($events) > 0) {
			foreach ($events as $event) {
				$content = '
					<p>'.__('404 URL: ', '404-notifier').'<a href="'.esc_url($event->url_404).'">'.esc_url($event->url_404).'</a></p>'."\n".'
					<p>'.__('Referring URL: ', '404-notifier').'<a href="'.esc_url($event->url_refer).'">'.esc_url($event->url_refer).'</a></p>
					<p>'.__('User Agent: ', '404-notifier').esc_html($event->user_agent).'</p>
				';
?>
	<item>
		<title><![CDATA[<?php echo('404: '.esc_html($event->url_404)); ?>]]></title>
		<link><![CDATA[<?php echo(esc_html($event->url_404)); ?>]]></link>
		<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', $event->date_gmt, false); ?></pubDate>
		<guid isPermaLink="false"><?php print($event->id); ?></guid>
		<description><![CDATA[<?php echo(strip_tags($content)); ?>]]></description>
		<content:encoded><![CDATA[<?php echo($content); ?>]]></content:encoded>
	</item>
<?php $items_count++; if (($items_count == get_option('posts_per_rss')) && !is_date()) { break; } } } ?>
</channel>
</rss>
<?php
		die();
	}
}

if (!function_exists('ak_check_email_address')) {
	function ak_check_email_address($email) {
// From: http://www.ilovejackdaniels.com/php/email-address-validation/
// First, we check that there's one @ symbol, and that the lengths are right
		if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email)) {
			// Email invalid because wrong number of characters in one section, or wrong number of @ symbols.
			return false;
		}
// Split it into sections to make life easier
		$email_array = explode("@", $email);
		$local_array = explode(".", $email_array[0]);
		for ($i = 0; $i < sizeof($local_array); $i++) {
			 if (!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$", $local_array[$i])) {
				return false;
			}
		}	
		if (!ereg("^\[?[0-9\.]+\]?$", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name
			$domain_array = explode(".", $email_array[1]);
			if (sizeof($domain_array) < 2) {
					return false; // Not enough parts to domain
			}
			for ($i = 0; $i < sizeof($domain_array); $i++) {
				if (!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$", $domain_array[$i])) {
					return false;
				}
			}
		}
		return true;
	}
}


function ak404_admin_init() {
	if ($_GET['page'] == basename(__FILE__)) {
		CF_Admin::load_js();
		CF_Admin::load_css();
	}
}
add_action('admin_init', 'ak404_admin_init');

register_activation_hook(N404_FILE, 'ak404_activate');
function ak404_activate() {
 	if (ak404_is_multisite() && ak404_is_network_activate()) {
		ak404_activate_for_network();
	}
	else {
		ak404_activate_single();
	}
}

function ak404_activate_single() {
	global $ak404, $wpdb;
	$ak404 = new ak_404;
	$tables = $wpdb->get_col("
		SHOW TABLES LIKE '$wpdb->ak_404_log'
	");
	if (!in_array($wpdb->ak_404_log, $tables)) {
		$ak404->install();
	}
}

function ak404_init() {
	global $ak404;		
	$ak404 = new ak_404;
	$ak404->get_settings();
}
add_action('init', 'ak404_init');

function ak404_log() {
	if (is_404()) {
		global $ak404;
		if (!is_a($ak404, 'ak_404')) {
			$ak404 = new ak_404;
		}
		$ak404->log_404();
	}
}
add_action('shutdown', 'ak404_log');

function ak404_admin_menu() {
	add_submenu_page(
		'index.php',
		__('404 Notifier Logs', '404-notifier'),
		__('404 Logs', '404-notifier'),
		'manage_options',
		basename(N404_FILE),
		'ak404_dashboard_page'
	);

	add_options_page(
		__('404 Notifier Options', '404-notifier'),
		__('404 Notifier', '404-notifier'),
		'manage_options',
		basename(N404_FILE),
		'ak404_options_form'
	);
}
add_action('admin_menu', 'ak404_admin_menu');

function ak404_dashboard_page() {
	global $ak404;
	$ak404->dashboard_page();
}

function ak404_options_form() {
	global $ak404;
	$ak404->options_form();
}

function ak404_request_handler() {
	global $ak404;
	if (!empty($_POST['ak_action'])) {
		switch($_POST['ak_action']) {
			case 'update_404_settings': 
				if (!check_admin_referer('404-notifier')) {
					die();
				}
				$ak404->update_settings();
				header('Location: '.admin_url('options-general.php?page='.basename(__FILE__).'&updated=true'));
				die();
				break;
		}
	}
	if (!empty($_GET['ak_action'])) {
		switch($_GET['ak_action']) {
			case '404_feed':
				$ak404->rss_feed();
				break;
		}
	}
}
add_action('init', 'ak404_request_handler', 99);

function ak404_plugin_action_links($links, $file) {
	return CF_Admin::plugin_action_links($links, $file, N404_FILE, '404-notifier');
}
add_filter('plugin_action_links', 'ak404_plugin_action_links', 10, 2);

function ak404_main_dashboard_widget() {
	global $wpdb;
	$events = $wpdb->get_results("
		SELECT *
		FROM $wpdb->ak_404_log
		ORDER BY date_gmt DESC
		LIMIT 5
	");
	if (count($events) > 0) {
		echo '<ul>';
		foreach ($events as $event) {
			echo('
	<li>
		<strong>'.__('404 URL:', '404-notifier').'</strong> <a href="'.esc_url($event->url_404).'">'.esc_html($event->url_404).'</a><br/>
		<strong>'.__('Referring URL:', '404-notifier').'</strong> '.(isset($event->url_refer) && !empty($event->url_refer) ? '<a href="'.esc_url($event->url_refer).'">'.esc_html($event->url_refer).'</a>' : '<span class="nonessential">'.__('N/A', '404-notifier').'</span>').'<br/>
		<strong>'.__('Remote Address:', '404-notifier').'</strong> '.(isset($event->remote_addr) && !empty($event->remote_addr) ? esc_html($event->remote_addr) : '<span class="nonessential">'.__('N/A', '404-notifier').'</span>').'<br/>
		<strong>'.__('Remote Host:', '404-notifier').'</strong> '.(isset($event->remote_host) && !empty($event->remote_host) ? esc_html($event->remote_host) : '<span class="nonessential">'.__('N/A', '404-notifier').'</span>').'<br/>
		<strong>'.__('User Agent:', '404-notifier').'</strong> '.(isset($event->user_agent) && !empty($event->user_agent) ? esc_html($event->user_agent) : '<span class="nonessential">'.__('N/A', '404-notifier').'</span>').'<br/>
		<strong>'.__('Date:', '404-notifier').'</strong> '.esc_html(mysql2date('D, d M Y H:i:s +0000', $event->date_gmt, false)).'
	</li>
			');
		}
		echo('
</ul>
<p class="textright"><a href="'.admin_url('index.php?page=404-notifier.php').'" class="button">'.__('View all').'</a></p>
		');
	}
	else {
		echo '<p><em>'.__('No logs to display&hellip;', '404-notifier').'</em></p>';
	}
}

function ak404_add_dashboard_widgets() {
	wp_add_dashboard_widget('ak404_dashboard_widget', __('Recent 404 Logs', '404-notifier'), 'ak404_main_dashboard_widget');
}
add_action('wp_dashboard_setup', 'ak404_add_dashboard_widgets');

//Multisite utility and integration functions 
function ak404_is_multisite() {
	return CF_Admin::is_multisite();		
}

function ak404_is_network_activation() {
	return CF_Admin::is_network_activation();
}

function ak404_activate_for_network() {
	CF_Admin::activate_for_network('ak404_activate_single');
}

function ak404_activate_plugin_for_new_blog($blog_id) {
	CF_Admin::activate_plugin_for_new_blog(N404_FILE, $blog_id, 'ak404_activate_single');
}
add_action( 'wpmu_new_blog', 'ak404_new_blog');

function ak404_switch_blog() {
	global $wpdb;
	$wpdb->ak_404_log = $wpdb->prefix.'ak_404_log';
}
add_action('switch_blog' , 'ak404_switch_blog');

?>