Find variety of codes and details discussion about the cookie both using JavaScript and PHP:

1. Set cookie through PHP and get through JavaScript
2. Set cookie through JavaScript and get through PHP
3. Set cookie in JavaScript and get through JavaScript
4. Set cookie through PHP and get through PHP
5. Set the Array Cookies
6. Delete all Cookies through PHP

1. Set cookie through PHP and get through JavaScript

<?php
//Page: set_cookie.php
//$_SERVER['HTTP_HOST'] = 'http://www.example.com ';
// localhost create problem on IE so this line
// to get the top level domain
$myDomain = ereg_replace("^[^.]*.([^.]*).(.*)$", '1.2', $_SERVER['HTTP_HOST']);
$setDomain = ($_SERVER['HTTP_HOST']) != "localhost" ? ".$myDomain" : false;
setcookie ("site", 'http://only-your-views.blogspot.com', time()+3600*24*(2), '/', "$setDomain", 0 );
// You can change (2) to any negative value (-2) for deleting it. It is number of days for cookie to keep live. Any -ve number will tell browser that it is useless now.
?>

<script>
function readCookie(name) {
 var cookiename = 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(cookiename) == 0) return c.substring(cookiename.length,c.length);
 }
 return null;
}
document.write("n" + readCookie('site'));
</script>

2. Set cookie through JavaScript and get through PHP

<script>
document.cookie = 'name=David' ;
</script>
Page: get_cookie.php
<?php
var_dump($_COOKIE['name']);
?>

3. Set cookie through JavaScript and get through JavaScript

<script type="text/javascript">
days = 3; // -ve for deleting it.
var date = new Date();
date.setTime(date.getTime ()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
document.cookie = 'language=ruby' + expires;
function readCookie(name)
{
 var cookiename = 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(cookiename) == 0) return c.substring(cookiename.length,c.length);
 }
 return null;
}
// refresh the page for getting the value or use this line in another page
document.write("n" + readCookie('language'));
</script>

4. Set cookie through PHP and get through PHP

<?php
//$_SERVER['HTTP_HOST'] = 'http://www.example.com ';
// localhost create problem on IE so this line
// to get the top level domain
$myDomain = ereg_replace('^[^.]*.([^.]*).(.*), '1.2', $_SERVER['HTTP_HOST']);
$setDomain = ($_SERVER['HTTP_HOST']) != "localhost" ? ".$myDomain" : false;
setcookie ("site2", 'http://only-your-views.blogspot.com', time()+3600*24*(2), '/', "$setDomain", 0 );
echo @$_COOKIE ['site2'];
?>

5. Set the Array Cookies

<?php
setcookie("cookie1[0]", "cookiethree");
setcookie("cookie1[1]", "cookietwo");
setcookie("cookie1[2]", "cookieone");
// after the page reloads, echo them out
if (isset($_COOKIE['cookie1']))
{
 foreach ($_COOKIE['cookie1'] as $name => $value)
 {
  echo "cookie1[$name] : $value <br />n";
 }
}
?>

6. Delete all Cookies through PHP

<?php
foreach ($_COOKIE as $k=>$v)
{
 if (is_array($_COOKIE[$k]))
 {
  foreach ($_COOKIE[$k] as $key=>$val)
  {
   setcookie($k.'['.$key.']',"", time()+3600*24*(-100));
  }
 }
 setcookie($k,"", time()+3600*24*(-100));
}
?>

Few facts about Cookie: