Wordpress setcookie() on splash page

Question

I'm having a Wordpress website, and on main page, if visitor is here for the first time, a 'Subscribe to newsletter' modal appears. I'm having a problem that cookie is not being set via setcookie() function:

<?php 
            if($_COOKIE['rcngVisited'] != 'true')
            {
                echo do_shortcode('[modal name="Subscribe to newsletter" style=button color=default size=default][/modal]'); 
                setcookie('rcngVisited','true', time()+60*60*24*30, '/readyclickandgo/');
            }
        ?>

Answer 1

You only set the cookie for readyclickandgo dir

Make sure you don't have any output before you set COOKIE, add this in your header:

<?php
    $visit = false;
    if($_COOKIE['rcngVisited'] != 'true'){
        setcookie('rcngVisited','true', time()+60*60*24*30, '/readyclickandgo/');
        $visit = true;
    }
?>

Add this anywhere you want in same page:

<?php
    if($visit){
        echo do_shortcode('[modal name="Subscribe to newsletter" style=button color=default size=default][/modal]'); 
    }
?>