Return of "?" instead of the special characters in a SELECT

Question

I’ve got a problem, I’ve encoded everything with utf-8, I’ve tried multiple ways to fix it and I can’t, in one <option> of HTML, I pull a table from the database, but it returns with a special character symbol instead of the accents as in the photo below:

The code of <select> is ésse

<select id="modalidade" name="modalidade" class="form-control">
        <?php
            header("Content-type:text/html; charset=utf-8");
            //require_once ('../model/Conexao.php');
            //mysql_set_charset('utf8');
            $sql = "SELECT * FROM modalidade";
            $cnx = mysqli_connect("localhost", "root", "", "olimpiada");
            $resultado = mysqli_query($cnx,$sql,MYSQLI_STORE_RESULT);
            $qtde = mysqli_num_rows($resultado);

            if($qtde>0)
            {
                while($linha = mysqli_fetch_array($resultado))
                {

                    echo "<option value=".$linha['idModalidade'].">";
                    echo $linha['modalidade'];
                    echo "</option>";

                }
            }
        ?>
</select>

Here is the database structure

Thanks in advance

Answer 1

Uses the function of PHP utf8_encode(), utf8_encode($linha['modalidade']);

Or change your table in the bank to SET=utf8 COLLATE utf8_unicode_ci