Добрый день!
Разбираюсь в ооп
оцените класс и ткните в ошибки.

<?php
include_once ($_SERVER['DOCUMENT_ROOT'].'/system/global.php');
 class settings {
var $anchor;
var $home;     
var $key_words;
var $description;
var $title_all;

function __construct(){
$this->anchor = '0';
connections::connect();
$sql = connections::get_query_simple("SELECT * FROM settings WHERE anchor = '".$this->anchor."'"); 
while ($row=mysql_fetch_assoc($sql)){  
$this->key_words = $row['key_words'];
$this->description = $row['description'];
$this->title_all = $row['title_all'];    
}
}


function edit(){
echo'
 <form name="settings_edit" method="post"  id="settings_edit" action="settings/settings_controller.php">
 Ключевые слова<br />
 <textarea  rows="10" cols="45" name="key_words">'.$this->key_words.'</textarea><br />
 Описание<br />
 <textarea  rows="10" cols="45" name="description">'.$this->description.'</textarea><br />
 Титульный<br />
 <input type="text" name="title_all" value="'.$this->title_all.'" size="58" /><br />
 <input class="arcticmodal-close" type="button" value="'; languages::output_languages('Close'); echo'" />
 <input onclick="savead(\'settings_edit\')" type="button"  value="'; languages::output_languages('save'); echo'" />
 </form>';    
}



function save(){
 connections::connect(); 
  $key_words = protections::protectmysql($this->key_words,'text');
  $description = protections::protectmysql($this->description,'text');
  $title_all = protections::protectmysql($this->title_all,'text');
  
  connections::connect();
  if(connections::get_query_simple("UPDATE `settings` SET `key_words`='".$key_words."',`description`='".$description."',`title_all`='".$title_all."'  WHERE anchor = '".$this->anchor."'")){
      $ok=languages::output_languages('done');
  }
 return $ok;   
  }     

  
  
function savehome($home = NULL){
    if($home){
$home = protections::protectmysql($home,'int');
    if($home !=""){ 
      connections::connect();
      connections::get_query_simple("UPDATE `settings` SET `home`='".$home."' WHERE anchor = '".$this->anchor."'");
    }
    }
    return $home;  
  }
 }
?>

include_once ($_SERVER['DOCUMENT_ROOT'].'/system/global.php');
header('Content-Type: text/html; charset=utf8'); 
  if(authorization::check($_COOKIE[HOST], '1', '0', '3') != '1'){
   die();   
  }
  $settings = new settings();
  echo' <div class="b-modal"><div id="done" ></div>';  
 if(isset($_POST['home'])){
  $settings->savehome($_POST['home']);   
 }elseif(isset($_POST['key_words']) && isset($_POST['description']) && isset($_POST['title_all'])){
 $settings->key_words = $_POST["key_words"];
$settings->description = $_POST["description"];
$settings->title_all = $_POST["title_all"];
 $settings->save();   
 }else{
$settings->edit();         
 }
 echo'</div>';