Having issue in my if condition in my php code - php

Question

I want to do is when a user click the login button and the inputs are empty its will echo please enter email and password and if the user put email and password wrong it will echo incorrect email and password .
My problem is when i click the login button and the inputs are empty it echo both please enter email and password and incorrect email and password.
I want to echo please enter email and password if both email and password are empty only and if one of email or password is wrong it should echo incorrect email and password.
<?php
require 'encryption.php';
include_once('database.php');
$db = new Connection();
$db = $db->dbConnect();
$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
$email = $_POST['email'];
$pass = $_POST['password'];
$hash_cost_log2 = 8;
$hash_portable = FALSE;
$hasher = new PasswordHash($hash_cost_log2, $hash_portable);
$hash = '*';
$login = $db->prepare("SELECT user_password FROM tbl_user WHERE user_email= :email");
$login->bindParam(':email', $email, PDO::PARAM_STR);
$login->execute();
$hash = $login->fetchColumn();
if(empty($email) && empty($pass)){
echo "Please enter Email and Password";
}
if($hasher->CheckPassword($pass, $hash))
{
$st = $db->prepare("SELECT * from tbl_user WHERE user_email=? AND user_password=? AND user_active='1'");
$st->bindParam(1, $email, PDO::PARAM_STR);
$st->bindParam(2, $hash, PDO::PARAM_STR);
$st->execute();
if($st->rowCount() === 1){
echo "1";
exit;
}
}else{
echo "Incorrect Email or Password";
}
?>

Answer 1

Change your second if to elseif.

Answer 2

Basically this:
if(empty($email) && empty($pass)){
echo "Please enter Email and Password";
} else {
if ($hasher->CheckPassword($pass, $hash))
echo "works"
} else {
echo "doesn't work"
}
}