How does the setcookie function in PHP work and what impact does it have on the current request?

The setcookie function in PHP is used to set a cookie in the user's browser. This function takes several parameters such as the cookie name, value, expiration time, path, domain, etc. Once a cookie is set using setcookie, it will be sent to the browser in the HTTP response headers. This cookie will then be included in subsequent requests made by the user to the same domain.

// Set a cookie named "user" with the value "JohnDoe" that expires in 1 hour
setcookie("user", "JohnDoe", time() + 3600, "/");