Setting Cookies in WordPress

So how do you set cookies in WordPress? With core constants:

COOKIEPATH — Server path in which the cookie will be available on.
COOKIE_DOMAIN — The (sub)domain that the cookie is available to.

Setting cookies in WordPress, especially the expiration is a cinch using one of the core time constants, available since v3.5:

MINUTE_IN_SECONDS = 60 seconds
HOUR_IN_SECONDS = 3,600 seconds
DAY_IN_SECONDS = 86,400 seconds
WEEK_IN_SECONDS = 604,800 seconds
MONTH_IN_SECONDS = 2,629,746 seconds
YEAR_IN_SECONDS = 31,556,952 seconds

Don’t forget to add the current timestamp to one of these constants, for example:

// 5 minutes into the future
$five_minutes = current_time( ‘timestamp’ ) + ( MINUTE_IN_SECONDS * 5 );