<?php
                            $total = get_query('Curs', 'cursos', 'NULL', 'NULL', 1);    //retorna el numero total de cursos
                            $mostrat = get_query('Curs', 'cursos', 'NULL', 'NULL', 2);

                            for ($i = 0; $i<= $total; $i++)
                            {
                                echo "<option>$mostrat[$i]</option>";
                            }
                        ?>

    function get_query($selection, $table, $column, $data, $option)
    {
        $configs = include("config.php");   //archivo de configuraciones basico

        $link = mysqli_connect($configs['ip'], $configs['username'], $configs['password'], $configs['bbdd']);

        switch ($option)
        {
            case 0:
                $sql = "SELECT $selection FROM $table WHERE $column = '$data'";
                break;
            case 1:
                $sql = "SELECT COUNT(*) as $selection from $table";
                break;
            case 2:
                $sql = "SELECT $selection FROM $table";
                break;
        }

        $result = mysqli_fetch_assoc(mysqli_query($link, $sql));

            return $result[$selection];

        mysqli_close($link);
    }