Envoyer – Zero Downtime PHP Web Development Services. It is nothing but the deployment tool used for the purpose to deploy PHP development applications. One of the best thing about the tool was zero downtime when it is under deployment. Your application and customers are not aware of using it that a new version has been pushed. Here know all about the Laravel Envoyer and its Zero Downtime PHP web development. One of the best thing about the tool was zero downtime when it is under deployment. Your application and customers are not aware of using it that a new version has been pushed.