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php set cookie redirect


itwit

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I need a domain example.com redirects to sub-domain a.example.com when I type on the address bar.

<script type="text/javascript">
$(function(){
    var city = readCookie('city');
    if(city==null && city==''){
    window.location.href = 'http://' + city + '.example.com';
}
$('#citygo').change(function(){
    var city = $(this).val();
    createCookie('city', city, 28);
    window.location.href = 'http://' + city + '.example.com';
});
});
</script>

<body>
<select id="citygo">
    <option value="0">Select City</option>
    <option value="amsterdam">Amsterdam</option>
    <option value="newyork">New York</option>
    <option value="london">London</option>
    <option value="cardiff">Cardiff</option>
    </select>
</body>

The cookie on the server side is not holding so the domain cannot remember sub-domain. What am i doing wrong? Any help will be very much appreciated.

<?php 
$hour = time() + 50400;  //Time you want the cookie to last, currently 14 hours 
setcookie(My_Site_Location, $_SERVER['citygo'], $hour, '/', 'example.com');

if (isset($_SERVER['citygo'])) {
   $cookies = explode(';', $_SERVER['citygo']);
   foreach ($cookies as $cookie) {
       list($cookie_id, $cookie_value) = explode('=', $cookie);
       if($cookie_id === $name){
          self::set_cookie($cookie_id, $value, $expiry, $path, $domain);
       }
   }
}
?>
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