<?php
$verificar=$_POST["enviar"];
if($verificar == 'Semanal'){ ?>
<form action="menu.php">
</form>
<?php
}
?>
<?php
$verificar=$_POST["enviar"];
if($verificar == 'Semanal'){
header('Location: menu.php');
}
?>
header("Location: http://menu.php");
die();
window.location.href = "http://menu.php";