When is a cookie file created in PHP?

A cookie file is created in PHP using the setcookie() function. This function must be called before any output is sent to the browser, as headers can only be set before any content is sent. To create a cookie file in PHP, you need to call the setcookie() function with the appropriate parameters such as the cookie name, value, expiration time, path, domain, and whether it should be secure.

// Create a cookie file in PHP
setcookie("username", "john_doe", time() + 3600, "/");