过滤html在线编辑器产生有危害代码

部分强大的在线编辑器，已经包含了代码整理，过滤功能，但js处理的能被很轻易的饶过，服务端必须要再次过滤一次，这几天花了点时间，写了部分，希望对大家有点用处，本人能力有限，还请有能力的朋友补全它。



/*不需要过滤的数组*/
$htm_on=array(
"<acronym","acronym>",
"<basefont","basefont>",
"<button","button>",
"<caption","caption>",
"<clientinformation","clientinformation>",
"<font","font>",
"<implementation","implementation>",
"<button","button>",
"<location","location>",
"<option","option>",
"<selection","selection>",
"<strong","strong>",
"font");

$htm_on_uper=array(
"<acronym","acronym>",
"<basefont","basefont>",
"<button","button>",
"<caption","caption>",
"<clientinformation","clientinformation>",
"<font","font>",
"<implementation","implementation>",
"<button","button>",
"<location","location>",
"<option","option>",
"<selection","selection>",
"<strong","strong>",
"font");

/*字符格式*/
$str=strtolower($str);
$str=preg_replace("//s+/", " ", $str);//过滤回车
$str=preg_replace("/ +/", " ", $str);//过滤多个空格

/*过滤/替换几种形式的js*/
$str=preg_replace("/<(script.*?)>(.*?)<(//script.*?)>/si","",$str);//删除<script>。。。</script>格式，
//$str=preg_replace("/<(script.*?)>(.*?)<(//script.*?)>/si","<//1>//2<//3>",$str);//替换为可以显示的，

$str=preg_replace("/<(script.*?)>/si","",$str);//删除<script>未封闭
//$str=preg_replace("/<(script.*?)>/si","<//1>",$str);//替换未封闭

/*删除/替换表单*/
$str=preg_replace("/<(//?form.*?)>/si","",$str);//删除表单
//$str=preg_replace("/<(//?form.*?)>/si","<//1>",$str);//替换表单

$str=preg_replace("/<(i?frame.*?)>(.*?)<(//i?frame.*?)>/si","",$str);//删除框架
//$str=preg_replace("/<(i?frame.*?)>(.*?)<(//i?frame.*?)>/si","<//1>//2<//3>",$str);//替换框架

/*过滤on事件*/
$str=preg_replace("/href=(.+?)([/"|/'| |>])/ie","'href='.strtoupper('//1').'//2'",$str);//把href=涉及到的on转换为大写。
$str=str_replace($htm_on,$htm_on_uper,$str);//把<font,font>换为大写,dhtml标签字符，正则判断太烦琐，采用转换办法。
$str=preg_replace("/(on[^ /.<>]+?)([ |>])/s","//2",$str);//取掉on事件

/*过滤超级连接的js*/
$str=preg_replace("/(href|src|background|url|dynsrc|expression|codebase)[=:/(]([ /"/']*?/w+/..*?|javascript|vbscript:[^>]*?)(/)?)([ >//])/si","//1='#' //3//4",$str);//取掉href=javascript:

//返回小写字符
$str=strtolower($str);
$str=str_replace("&","&",$str);

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