Trying to display Rand() after inserting in db

Question

Hello,

I’m trying to display a random number with Rand() after inserting it into the database. mysql insertion works normally, but when I try to display a message with the $request variable nothing is shown.

If I insert something into the database using a variable this variable becomes empty after insertion?

Here is the code.

<?php 
$codigo = $_POST['codigo'];
$produto = $_POST['produto'];
$valor = $_POST['valor'];
$pedido = rand(1,400);

if (insereProduto($conexao, $codigo, $produto, $valor, $pedido)) { ?>
	<div class="alert alert-danger" role="alert">
		<span class="glyphicon glyphicon-exclamation-sign" aria-hidden="true"></span>
		Pedido salvo com sucesso!
	</div>
	<?php
} else { ?>
	<div class="alert alert-success" role="alert">
		<span class="glyphicon glyphicon-ok" aria-hidden="true"></span>
		Pedido salvo com sucesso!,  O numero do pedido é <?php= $pedido; ?>
	</div>
<?php
}
 ?>
 <br />
<button class="btn btn-warning" onClick="javascript:window.location.href='novo-pedido.php'">Fazer novo pedido</button>