Setting PHP's default timezone

Question

In my web app, I let the users choose their preferred timezone from a list (that contains all timezones that PHP supports).

Let\'s say that $_POST[\'timezone\']

Answer 1

Set a cookie that contains the timezone the user chooses.

/// Make sure you sanitize all POST/COOKIE variables if needed.
$timezone = $_COOKIE['timezone'];

if(isset($_POST['timezone'])) {
    /// Set cookie for some amount of time -- I chose 2 weeks
    setcookie('timezone',$_POST['timezone'],time()+60*60*24*14);
    $timezone = $_POST['timezone'];
}

default_date_timezone_set($timezone);