How can PHP developers ensure a seamless transition between secure and non-secure connections without triggering security warnings?

To ensure a seamless transition between secure and non-secure connections without triggering security warnings, PHP developers can use the "secure" attribute in cookies to ensure they are only sent over secure connections. By setting this attribute, the cookie will not be sent over non-secure connections, preventing any security warnings from being triggered.

// Set a cookie with the "secure" attribute
setcookie('cookie_name', 'cookie_value', time() + 3600, '/', '', true, true);