src/classes/CCCookie.php
public static function once( $key ) {
		if ( !is_null( static::get( $key ) ) ) {
				
			$cookie = static::get( $key );
			static::delete( $key );
			
			return $cookie;
		}
	}
public static function once( $key ) {
		if ( !is_null( static::get( $key ) ) ) {
				
			$cookie = static::get( $key );
			static::delete( $key );
			
			return $cookie;
		}
	}
public static function once ( $ key ) { if ( ! is_null ( static :: get ( $ key ) ) ) { $ cookie = static :: get ( $ key ) ; static :: delete ( $ key ) ; return $ cookie ; } }
eat a cookie, means get it once

@param string 	$key
@return mixed
eat a cookie means get it once