You can welcome the client to your billing system or welcome them back if they have returned. You can do so using this code:
<?php
if (strpos($_SERVER['REQUEST_URI'], "customers") || strpos($_SERVER['REQUEST_URI'], "order") !== false){
$today_date = date('Y-m-d H:i:s');
if($client->date_added == $today_date){
echo "Welcome ";
echo $client->first_name;
echo "...";
}else{
echo "Welcome back ";
echo $client->first_name;
echo "!";
}
}
?>