PHP去掉html中的空行、空白函数

[php] 
function DeleteHtml($str){ 
                    $str = trim($str); 
                    $str = ereg_replace("/t","",$str); 
                    $str = ereg_replace("/r/n","",$str); 
                    $str = ereg_replace("/r","",$str); 
                    $str = ereg_replace("/n","",$str); 
                    return trim($str); 
                }