add userID to database

insert.php

 <?php
+session_start();
 include_once "dbconnection.php";
-$query = "INSERT INTO toDoList (task) VALUES (?) ";
-
-$query = $link->prepare($query);
-$query -> bind_param('s', $_POST['task']);
-$query -> execute();
+//$query = "INSERT INTO toDoList (task) VALUES (?) ";
+$query1 = "INSERT INTO toDoList (task, userID) VALUES (?,?) ";
+$query1 = $link->prepare($query1);
+$query1 -> bind_param('si', $_POST['task'], $_SESSION['id']);
+//$query -> bind_param('si', $_POST['task']);
+$query1 -> execute();
 
 $last_id = mysqli_insert_id($link);
 echo $last_id;
-$query -> close();
+$query1 -> close();
 $link -> close();
 ?>

login_check.php

-<?php
-  error_reporting(0);
-
-  $user = $_POST['username'];
-  $pass = $_POST['password'];
-
-  //login
-  if(isset($_POST['submit'])){
-    if($user=="admin" && $pass=="admin"){
-      header('Location:index.php');
-      session_name($user);
-      session_start();
-    }
-    else{
-      echo "Wrong Username or/and Password";
-    }
-  }
-
-  //logout
-  if(isset($_POST['logout'])) {
-    session_name($user);
-    session_start();
-    session_unset();
-    session_destroy();
-    session_write_close();
-    setcookie(session_name(), '', 0,'/');
-    session_regenerate_id(true);
-    header('Location: login_page.php');
-    exit();
-  }
-?>
\ No newline at end of file