Fatal error in php. undefined mail ()

I hope you have a good day. I am developing a simple page as a practice of what I learned about php so far. everything came on wheels until I found an error that has stalled me and I can not correct it. Thank you very much everyone for reading and for your help. Here I leave the exact error.

  

"Fatal error: Uncaught Error: Call to undefined function From:   Test Form <'[email protected]'> ;; mail () in   C: \ xampp \ htdocs \ Test \ form.php: 32 Stack trace: # 0 {main} thrown   in C: \ xampp \ htdocs \ Test \ form.php on line 32 "

Below I leave the code block:           

    $de = $_POST["name"];

    $destino = "[email protected]";

    $asunto = "FORMULARIO DESDE MI SITIO WEB";

    $mensaje .= "FORMULARIO.";

    $mensaje .= "\n";

    $mensaje .= "NOMBRE:" . utf8_decode($_POST["name"]) ."\n";

    $mensaje .= "\n";

  $mensaje .= "EMAIL: " . utf8_decode($_POST["email"]) ."\n";

  $mensaje .= "MENSAJE: " . utf8_decode($_POST["message"]) ."\n";

  $mensaje .= "\n";

    $emailheader = "From: Formulario prueba <'[email protected]'>;

mail"($destino, $asunto, $mensaje, $emailheader) or die ("Lo sentimos, su solicitud no ha sido enviada.<br/>Intentelo de nuevo.");

echo utf8_decode(utf8_encode('Tu consulta ha sido enviada correctamente, Le respoderemos a la brevedad.'));

    } else {

    if($_POST["name"] == ""){

    echo utf8_encode ('Por favor, indica tu nombre.');

    exit; }

    if($_POST["email"] == ""){

    echo utf8_encode ('Por favor, indica un email de contacto.');

    exit; }

  if($_POST["message"] == ""){
  echo utf8_encode ('Por favor, escribenos tu consulta.');
}
}