<?php
function custom_login_logo() { echo '<style type="text/css"> h1 a { background-image: url('.get_bloginfo('template_directory').'/images/admin-logo.png) !important; } </style>'; } add_action('login_head', 'custom_login_logo');

/*Replace admin Howdy*/
add_filter('gettext', 'change_howdy', 10, 3);

function change_howdy($translated, $text, $domain) {

    if (!is_admin() || 'default' != $domain)
        return $translated;

    if (false !== strpos($translated, 'Howdy'))
        return str_replace('Howdy', 'Welcome', $translated);

    return $translated;
}
/*end Replace admin Howdy*/