<?
$code=$_GET['code'];

if(!isset($code)) { echo $code;?>
<form action="b.php" method="GET">
    <input type="number" name="code">
    <input type="submit" value="enviar">
</form>
<? }else{ ?>
    <a href="my.bluetoothprint.scheme://https://practipastajj.com/dashboard/movil/a.php?code=<?echo $code;?>">aqui</a><?
}?>
