PHP - mysql_fetch_array en php7.4.3

if (isset($_POST["editar"]))

{

    echo "<form action='newfile.php' method='post'>";

    echo "<table border=1>";

    $h_id=$_POST["h_id"];

    $datos = $db->query("select * from rutas where id='$h_id'");

    $fila =mysql_fetch_array($datos);

    $info_tabla = $db->query("describe rutas");

    //foreach($info_tabla as $row)

    while($row = mysql_fetch_array($info_tabla))

    {

        $field=$row[Field];

        echo("<tr>");

        echo("<td>".$row[Field]."</td><td><input type='text' name='".$row[Field]."'value='".$fila[$field]."'></td>");

        echo("</tr>");

    }

    echo"</table>";

    echo("<input type='submit' name='modificar' value='Modificar'> <input type='hidden' name='h_id' value='".$h_id."'</td>");

    echo "</form>";

}