Unable to AES_DECRYPT after AES_ENCRYPT in mysql

Question

I created user table

CREATE  TABLE `user` (
`id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT ,
`first_name` VARBINARY(100) NULL ,
`address` VARBINARY(200) NOT N         


        

Answer 1

if (isset($_POST['user_name']) and isset($_POST['user_password'])){

$user_name = $_POST['user_name'];
$user_password = $_POST['user_password'];


$query = "SELECT * FROM `user_tbl` WHERE user_name='$user_name' and AES_DECRYPT(user_password , '@ert') = '$user_password'";

$result = mysqli_query($connection, $query) or die(mysqli_error($connection));
$count = mysqli_num_rows($result);