This sample delete code wont delete items from database - php

Question

This a sample delete code I created to delete entries MySQL database. When I execute this code, Successful message displays but entries wont delete from the database. Records are kept track the primary key in the 'events' table 'id'
<?php
require 'dbconnect.php';
session_start();
$id=$_SESSION['id'];
$id = "0";
if ( !empty($_GET['id'])) {
$id = $_REQUEST['id'];
}
if ( !empty($_POST)) {
// keep track post values
$id = $_POST['id'];
// delete data
$sql="DELETE * FROM events WHERE events.id='$id'"; //mysqli query
$result=mysqli_query($conn,$sql); //connection string and mysqli query variable
if($result==true)
{
echo "<script type='text/javascript'>alert('successfully DELETED!')</script>"; // javascript message for Successful delete
echo "<script>setTimeout(\"location.href = 'list_events.php';\",15);</script>"; // return page
}
else
{
echo "<script type='text/javascript'>alert('failed to DELETE RETRY!')</script>"; //failed to delete message
echo "<script>setTimeout(\"location.href = 'list_events.php';\",15);</script>"; //return page
}
header("Location: list_events.php"); // header page
}
?>

Answer 1

You can use this
$sql="DELETE FROM events WHERE events.id='{$id}'"; //mysqli query
Just to be safe.
Do check if you are getting some value in $id and it also exist in database.

Answer 2

Use DELETE FROM instead of DELETE * FROM and you can use the following commands for more security:
$sql="DELETE FROM events WHERE events.id=?";
$stmt = $mysqli->prepare($sql);
$stmt->bind_param('d',$id);
/* execute prepared statement */
$result = $stmt->execute();