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- $sql = "select * from user where username = '$username' and password = '$password' ";
- echo $sql;
- $query = mysql_query($conn,$sql);
- $num_rows = mysql_num_rows($query);
- printf("Result set has %d rows.\n",$num_rows);
- if ($num_rows==0) {
- echo "tên đăng nhập hoặc mật khẩu không đúng !";
- }
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