php下过滤HTML代码的函数

*----------------------
过滤HTML代码的函数
-----------------------*/
function htmlEncode($string) {
$string=trim($string);
$string=str_replace("&","&",$string);
$string=str_replace("'","'",$string);
$string=str_replace("&","&",$string);
$string=str_replace(""",""",$string);
$string=str_replace("/"",""",$string);
$string=str_replace("&lt;","<",$string);
$string=str_replace("<","<",$string);
$string=str_replace("&gt;",">",$string);
$string=str_replace(">",">",$string);
$string=str_replace("&nbsp;"," ",$string);
$string=nl2br($string);
return $string;
}