How to delete cookie on codeigniter - php

Question

I don't know how to delete a cookie. I want is when I submit a form. The cookie is also delete. I try the delete_cookie("name") but is not working. I think because the cookie I created by javascript. Please check my code to fix this problem.
This is my sample text field:
<input name="cargo_no" type="text" class="validate[required]" id="cargonumber" onchange="setCookie('cargonumberC', this.value, 365);"/>
and this is the javascript
function setCookie(cookieName, cookieValue, nDays) {
var today = new Date();
var expire = new Date();
if (!nDays)
nDays=1;
expire.setTime(today.getTime() + 3600000*24*nDays);
document.cookie = cookieName+"="+escape(cookieValue) + ";expires="+expire.toGMTString();
}
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ' ') c = c.substring(1, c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
}
return null;
}
document.addEventListener('DOMContentLoaded', function() {
var themeSelect = document.getElementById('cargonumber');
var selectedTheme = readCookie('cargonumberC');
if (selectedTheme) {
themeSelect.value = selectedTheme;
}
});

Answer 1

Using Codeigniter, put it inside the save method of your controller:
Try:
delete_cookie('name', $domain, $path);
Details on official documentation

Answer 2

You can delete cookie from CodeIgniter. Use cookie helper like
$this->load->helper('cookie');
delete_cookie("name");

Answer 3

To delete a cookie use:
helper('cookie');
delete_cookie('remember_me');

Answer 4

You can't delete a cookie. The browser (or the user) has the delete the cookie(s). But, you can make the browser auto-remove the cookie by setting the expiration of the cookie to a date in the past. Here's a JavaScript example.
function deleteCookie(cookieName, cookieValue) {
document.cookie = cookieName+"="+escape(cookieValue) + ";expires=Thu, 01 Jan 1970 00:00:01 GMT;";
}