PDO delete from MySQL - php

Question

I have a problem with a PDO code.
I try the code below.
$id = null;
if ( !empty($_GET['t_id'])) {
$id = $_REQUEST['t_id'];
}
$action = isset($_POST['_DELETE_']) ? $_POST['_DELETE_'] : "";
if ($action == 'do_not_delete') {
header("Location: index.php?action=DEL_ERROR");
}
if($action=='delete') {
$host = "localhost";
$db_name = "_notice";
$username = "root";
$password = "111";
$con = new PDO("mysql:host={$host};dbname={$db_name}", $username, $password);
$id = $_REQUEST['t_id'];
$query = "DELETE FROM topics WHERE topic_id = ?";
$stmt = $con->prepare($query);
$stmt->bindParam(1, $id);
$exc = $stmt->execute();
if($exc){
$con = null;
header("Location: index.php?action=DEL_OK");
}else{
$con = null;
header("Location: index.php?action=DEL_ERROR");
}}
Anything happens (dose not delete element from the database).
I have no errors on page; even when i use a try catch block, or page parameter like index.php?action=DELETE

Answer 1

You need to call $stmt->execute() after preparing the query and binding parameters.
Update:
You are checking the content of $_GET['t_id'] but always setting $id to $_REQUEST['t_id'], and everything will execute only if $_POST['_DELETE_'] contains delete.
Also, try to check the resulting query and parameters with $stmt->debugDumpParams() before executing and maybe replace your bindParam with $stmt->bindParam(1, $id, PDO::PARAM_INT).