Nahradenie retazca v css subore

class setSettings {
  var $post;
  var $file;
  function setThirdColumn($post,$file){
    
    if($post=="ano"){
      $this->active=1;
    } elseif($post=="nie"){
      $this->active=0;
    }

    /*$this->handle=fopen($file,"r+");                         // otvaram css subor
    $this->contents = '';
    while (!feof($this->handle)) {
    $this->contents .= fread($this->handle, filesize($file));    // nacitavam css subor do premennej
    }
    fclose($this->handle);  */
    if(!$this->lol=file_get_contents($file,true)){ echo "LOOOOOL";}                                              // zatváram css subor
  
    if($this->active==1){                                                 // vytvaram podmienku pre nahradenie
     $this->s=str_replace("#obsah {
    float:right;
    width:80%;","#obsah {
    float:left;
    width:60%;",$this->lol);
    } elseif($this->active==0){
      $this->s=str_replace("#obsah {
    float:left;
    width:60%;","#obsah {
    float:right;
    width:80%;",$this->lol);
 
    }
                   
  
    $this->d=fopen($file,"w");    // otvaram css subor pre nahratie noveho obsahu
    if(!fwrite($this->d,$this->s)){ echo "dvojity lol";}                       // nahravam novy obsah  
    //echo $s;                             // vypisujem novy obsah
    fclose($this->d); 
  
    mysql_query("UPDATE class_settings SET active_3rd_column='".$this->active."' LIMIT 1");
    header("Location: ".$_SERVER['HTTP_REFERER']);
  }

}