HOOOOOOOLA

<?php
$servername = "127.0.0.1:3307"; /*La direccion de tu server*/
$username = "root";/*El user pa ingresar a la base*/
$password = "root";/*La contra para acceder a la base*/
$dbname = "dbo";/*El nombre de la base de datos*/

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}



$magia = "capybara";
$sql = "SELECT * FROM alta";


$result = mysqli_query($conn, $magia);
$result_sql = mysqli_query($conn, $sql);

if (isset($_POST['valorCaja1'])){
$comprobacion = $_POST['valorCaja1'] == $magia;
}
 else{}

if($comprobacion == TRUE)
{
	echo "acertaste";
	if (mysqli_num_rows($result_sql) > 0) {

	echo "<form><select>";
    while($row = mysqli_fetch_assoc($result_sql)) {

        echo  " <option background='red'>".$row['Nombre']."</option>";
    }
	echo "</select></form>";
}
}
else{
	echo "fallaste";
}
mysqli_close($conn);


?>