wordpress admin_notices (debugging)

$bh_errorMessages=array();

function bh_save_details(){
    global $post, $bh_errorMessages;

    $bh_errorMessages[]="test error";
    $bh_errorMessages[]="another test error";
}

function bh_printErrorMessages(){
    global $bh_errorMessages;

    $output='';

    if(!empty($bh_errorMessages)){
        $output='<div class="error">';
        foreach($bh_errorMessages as $msg){
            $output.='<p>'.$msg.'<p>';
        }
        $output.='</div>';
    }

    echo $output;
}


add_action('admin_notices', 'bh_printErrorMessages');

add_action('save_post', 'bh_save_details');