string issue of utf-8 encoding with PHP and MySQL?

This is what I tried so far,by modifying php.ini: default_charset = "utf-8"

This is how MySQL is configured:

mysql> show variables like '%char%';
+--------------------------+-----------------------------------------------+
| Variable_name            | Value                                         |
+--------------------------+-----------------------------------------------+
| character_set_client     | utf8                                          |
| character_set_connection | utf8                                          |
| character_set_database   | utf8                                          |
| character_set_filesystem | binary                                        |
| character_set_results    | utf8                                          |
| character_set_server     | utf8                                          |
| character_set_system     | utf8                                          |
| character_sets_dir       | f:\wamp\bin\mysql\mysql5.0.45\share\charsets\ |
+--------------------------+-----------------------------------------------+
8 rows in set (0.00 sec)

But it doesn't work.

I've dumped the data,it is in utf-8 format before and after processing by PHP.

But after inserting into MySQL by PHP,

it becomes a big mess(through phpmyadmin),

The data became something like this after inserting into database:

江苏省 江阴市 山观镇 西苑 新村

what's worse,the data become normal again after reading it from MySQL and showing on the page!

Can someone point out what's the real problem here?

The code are all things like:

$dml = "insert into profiles(accountId,name,thumbnail,sex,homeAddr,livingAddr,peoples,married,politicalStatus,qq,mobilePhone,telephone,homePage) 
    		value($accountId,'{$_POST['name']}',{$_POST['thumbnail']},{$_POST['sex']},'{$_POST['homeAddr']}','{$_POST['livingAddr']}','{$_POST['peoples']}',{$_POST['married']},'{$_POST['politicalStatus']}',{$_POST['qq']},{$_POST['mobilePhone']},{$_POST['telephone']},{$_POST['homePage']})";
mysql_query($dml,$con);