为什么我尝试删除帖子时出现此错误？

Question

for school i have to make a online portfolio with a cms. for the most part it is going well, but when i try to add a delete function, so a admin can delete a post i get a error from google chrome: Notice: Undefined variable: id in C:\\xampp\\htdocs\\portfoliojbehrens\\admin\\delete.php on line 4. the code :

delete.php:

 <?php
include_once("../includes/functions.php");
sec_session_start();
  deletePost($mysqli, $id).($_GET['id']);
?>

and the functions page of this:

function getAdminPosts($mysqli)
{
    $query = "SELECT * FROM posts";
    $post = array();

    if ($result = mysqli_query($mysqli, $query)) {
        while ($row = mysqli_fetch_assoc($result)) {
            $post[] = $row;
            echo "<tr><td>".$row['title']."</td><td>".$row['author']."</td><td><a href=\"delete.php?id=".$row['id']."\">Delete</a><br /><a href=\"edit.php?id=".$row['id']. "\">Edit</a></td></tr>";
        }
    }
}
function deletePost($mysqli, $id){
    $id = (int) $id;
    $query = "DELETE FROM posts WHERE ID = $id";
    mysqli_query($mysqli, $query);
    return true;
    header("Location: ../admin/posts.php");
}

i hope u can help me with this

Answer 1

It looks like deletePost() just sets a header to the posts.php page. You're trying to access $id which is never defined.

Update delete.php as follows:

include_once("../includes/functions.php");
sec_session_start();
deletePost($mysqli, $_GET['id']);