PHP page connects to the database, loads but does not delete

Question

Could you help me identify what’s wrong with this code?

<?php
     include ("conexao.php");?>
     <?php
     $id = isset ($_POST['id']) ? $_POST['id']:'';
     $sql= "DELETE FROM `guaxinim` WHERE `guaxinim`.`id`=".$id;
     $result = mysqli_query($conn, $sql);
     if($result)
         die ("O registro foi excluído.");
      else
         echo "Infelizmente não foi possível excluir.";

    header('Location: cadastros.php');
?>

because the page loads when I take the "header" appears that it worked and does not appear to be an error, but when I check the database the data is still there.

Answer 1

How are you working with anchor (links with parameters) and not with form (<form>), you must use $_GET instead of $_POST, for example:

$id = isset ($_GET['id']) ? $_GET['id'] : '';

Do not forget to remove the echo, otherwise header won’t work.