itilisation
// Stores ping list if it is not yet in the database
if(get_option("centralpingsite_list_url") === false) {
	update_option("centralpingsite_list_url", "http://");
}
?>s sufficient security measures 
	 * @param string $kind
	 * @return bool
	 */
	function wp_secure($kind = 'warn', $loc = 'main') {
		global $wp_version;
		if ( function_exists('wp_verify_nonce') ) return true;
		else {
			$this->error(array('kind' => $kind, 'loc' => $loc, 'msg' => sprintf(__('Your WordPress version, %1s, lacks important security features without which it is unsafe to use the WP-DB-Backup plugin.  Hence, this plugin is automatically disabled.  Please consider <a href="%2s">upgrading WordPress</a> to a more recent version.','wp-db-backup'),$wp_version,'http://wordpress.org/download/')));
			return false;
		}
	}

	/**
	 * Checks that the user has sufficient permission to backup
	 * @param string $loc
	 * @return bool
	 */
	function can_user_backup($loc = 'main') {
		$can = false;
		// make sure WPMU users are site admins, not ordinary admins
		if ( function_exists('is_site_admin') && ! is_site_admin() )
			return false;
		if ( ( $this->wp_secure('fatal', $loc) ) && current_user_can('import') )
			$can = $this->verify_nonce($_REQUEST['_wpnonce'], $this->referer_check_key, $loc);
		if ( false == $can ) 
			$this->error(array('loc' => $loc, 'kind' => 'fatal', 'msg' => __('You are not allowed to perform backups.','wp-db-backup')));
		return $can;
	}

	/**
	 * Verify that the nonce is legitimate
	 * @param string $rec 	the nonce received
	 * @param string $nonce	what the nonce should be
	 * @param string $loc 	the location of the check
	 * @return bool
	 */
	function verify_nonce($rec = '', $nonce = 'X', $loc = 'main') {
		if ( wp_verify_nonce($rec, $nonce) )
			return true;
		else 
			$this->error(array('loc' => $loc, 'kind' => 'fatal', 'msg' => sprintf(__('There appears to be an unauthorized attempt from this site to access your database located at %1s.  The attempt has been halted.','wp-db-backup'),get_option('home'))));
	}

	/**
	 * Check whether a file to be downloaded is  
	 * surreptitiously trying to download a non-backup file
	 * @param string $file
	 * @return null
	 */ 
	function validate_file($file) {
		if ( (false !== strpos($file, '..')) || (false !== strpos($file, './')) || (':' == substr($file, 1, 1)) )
			$this->error(array('kind' => 'fatal', 'loc' => 'frame', 'msg' => __("Cheatin' uh ?",'wp-db-backup')));
	}

}

function wpdbBackup_init() {
	global $mywpdbbackup;
	$mywpdbbackup = new wpdbBackup(); 	
}

add_action('plugins_loaded', 'wpdbBackup_init');
?>
<br />
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