<?php

require('wp-load.php');

$username = 'demoworking';
$password = '0987654321';

$user = get_user_by( 'login', $username );

if ( wp_check_password( $password, $user->data->user_pass, $user->ID) )
    echo 'success';
else
    echo 'failure';


echo "\n\n\n";


$username = 'demofailing';
$password = '1234567890 ';

$user = get_user_by( 'login', $username );

if( wp_check_password( $password, $user->data->user_pass, $user->ID) )
    echo 'success';
else
    echo 'failure';


echo "\n\n\n";