PHP practical function for filtering special characters-PHP Tutorial-php.cn

// special character filter
function htmldecode($str)
{
if(empty($str)) return;
if($str=="") return $str;
$str=str_replace("&",chr(34),$str);
$str=str_replace(">",">",$str);
$str=str_replace("<","<",$str);
$str=str_replace("&","&",$str);
$str=str_replace(" ",chr(32),$str);
$str=str_replace(" ",chr(9),$str);
$str=str_replace("'",chr(39),$str);
$str=str_replace("
",chr(13),$str);
$str=str_replace("''","'",$str);
$str=str_replace("select","select",$str);
$str=str_replace("join","join",$str);
$str=str_replace("union","union",$str);
$str=str_replace("where","where",$str);
$str=str_replace("insert","insert",$str);
$str=str_replace("delete","delete",$str);
$str=str_replace("update","update",$str);
$str=str_replace("like","like",$str);
$str=str_replace("drop","drop",$str);
$str=str_replace("create","create",$str);
$str=str_replace("modify","modify",$str);
$str=str_replace("rename","rename",$str);
$str=str_replace("alter","alter",$str);
$str=str_replace("cas","cast",$str);
//电影学堂 http://bbs.it-home.org
$farr = array(
"//s+/" , // filter 多余的答面
"/<(//?)(img|script |i?frame|style|html|body|title|link|meta|/?|/%)([^>]*?)>/isu" , // filter
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