html防止sql注入的方法：

1.批量过滤post、get敏感数据，例如：

$_GET = stripslashes_array($_GET);
$_POST = stripslashes_array($_POST);

2.使用数据过滤函数，例如：

function stripslashes_array(&$array) {
while(list($key,$var) = each($array)) {
if ($key != "argc" && $key != "argv" && (strtoupper($key) != $key || "".intval($key) == "$key")) {
if (is_string($var)) {
$array[$key] = stripslashes($var);
}
if (is_array($var)) {
$array[$key] = stripslashes_array($var);
}
}
}
return $array; 
}

3.替换HTML尾标签,为过滤服务，例如：

function lib_replace_end_tag($str)
{
if (empty($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("", "", $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);
$str=str_replace("&","&",$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);
$str=str_replace("
",chr(13),$str);
$str=str_replace("""",""",$str);
$str=str_replace("css",""",$str);
$str=str_replace("CSS",""",$str);
return $str; 
}