我的用户都是user,密码一个是空,一个是******$username = $_POST['username'];
$password = $_POST['password'];判断时的查询
select * from tbl_name where username='$username' and password='$password'
$password = $_POST['password'];判断时的查询
select * from tbl_name where username='$username' and password='$password'
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