PHP字符过滤方法
function str_filter_replace($str) { if (empty($str)) return false; $str = htmlspecialchars($str); $str = str_replace( '/', "", $str); $str = str_replace("\\", "", $str); $str = str_replace(">", "", $str); $str = str_replace("<", "", $str); $str = str_replace("<SCRIPT>", "", $str); $str = str_replace("</SCRIPT>", "", $str); $str = str_replace("<script>", "", $str); $str = str_replace("</script>", "", $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); $str=str_replace("&","&",$str); $str=str_replace(">",">",$str); $str=str_replace("<","<",$str); $str=str_replace(" ",chr(32),$str); $str=str_replace(" ",chr(9),$str); $str=str_replace(" ",chr(9),$str); $str=str_replace("&",chr(34),$str); $str=str_replace("'",chr(39),$str); $str=str_replace("<br />",chr(13),$str); $str=str_replace("''","'",$str); $str=str_replace("css","'",$str); $str=str_replace("CSS","'",$str); return $str; }