Send a PDF attachment generated by fpdf using wp_mail

hi all!

I’m working on a custom form that when I click send, it should pick up some fields in this form, generate a PDF and send by email.
And for this I’m using the FPDF class that ultimately allows me to generate the pdf file and puts it into a string. But when I try to send this string with all the headers, the file arrives attached to the name “noname.pdf.” And when I send email through the path of a file that is on disk, the file usually arrives, but I did not want to save the file on disk but only work with memory.

Could anyone help me?

Below is my code, thanks!

<?php
include("wp-blog-header.php");
get_header();

$largura = $_POST['largura'];

require('fpdf/fpdf.php');
define('FPDF_FONTPATH', 'fpdf/font');
$pdf = new FPDF();
$pdf->open();
$pdf->AddPage();
$pdf->SetFont('helvetica', '', 10);
$pdf->SetMargins(0, 0, 0);
$pdf->SetY("2.25");
$pdf->SetX("11.6");
$pdf->Cell(100, 10, $largura);
$pdfdoc = $pdf->Output("", "S");

$separador = md5(time());

$attachment = chunk_split(base64_encode($pdfdoc));
$from = "gleite@azclick.com.br";
$subject = "Email de teste";
$message = "Este é o corpo da mensagem.";

$nomeArquivo = 'teste.pdf';

$headers  = "From: ".$from."\r\n";
$headers .= "MIME-Version: 1.0"."\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"".$separador."\"";
$headers .= "Content-Transfer-Encoding: 8bit"."\r\n";
$headers .= "This is a MIME encoded message."."\r\n";
$headers .= "Content-Type: application/octet-stream name=\"".$nomeArquivo."\"";
$headers .= "Content-Transfer-Encoding: base64";
$headers .= "Content-Disposition: attachment; filename=\"".$nomeArquivo."\"";

$envio = wp_mail($to, $subject, $message, $headers, $attachment);
if($envio){
	$result = 'E-mail enviado com sucesso.';
} else{
	$result = 'Ocorreu um erro ao enviar seu orçamento.';
}
?>