<?php
if (is_user_logged_in()) {
    $userLoggedIn = true;
    if (isset($_POST['spLogout'])) {
        wp_logout();
        $userLoggedIn = false;
    }
} else {
    $userLoggedIn = false;
    if (isset($_POST['spLogin'])) {
        $ax_user = $_POST['email'];
        $ax_pswd = $_POST['pswd'];
        $creds = array(
            'user_login'    => $ax_user,
            'user_password' => $ax_pswd,
            'remember'      => true
        );

        $user = wp_signon( $creds, false);

        if (is_wp_error($user)) {
            echo $user->get_error_message();
        } else {
            $userLoggedIn = true;
        }
    }
}

?>

add_filter('init', 'ax_get_user_info');
function avox_get_user_info() {
    if (is_user_logged_in()) {
        $currentUser = wp_get_current_user();
        $fName = $currentUser->user_firstname;
    }
    return $fName;
}