Send background emails PHP [duplicate]

I have a user registration system, and after the user has registered it is necessary to confirm the account in the email, the problem is that the page takes a while to load and this can generate a little uneasiness or even confuse the user (by the delay may think something is wrong), some languages were aware that some things were run in the background but never knew anything by php, is there any way to send emails through the background with php? I'm using PHPMailer and a local WAMP server, and Linux on the web host.