Generate a list of timezones with PHP

Generate a list of timezones with PHP

http://www.php.net/manual/en/function.timezone-identifiers-list.php

<?php
$zones = timezone_identifiers_list();
        
foreach ($zones as $zone) 
{
    $zoneExploded = explode('/', $zone); // 0 => Continent, 1 => City
    
    // Only use "friendly" continent names
    if ($zoneExploded[0] == 'Africa' || $zoneExploded[0] == 'America' || $zoneExploded[0] == 'Antarctica' || $zoneExploded[0] == 'Arctic' || $zoneExploded[0] == 'Asia' || $zoneExploded[0] == 'Atlantic' || $zoneExploded[0] == 'Australia' || $zoneExploded[0] == 'Europe' || $zoneExploded[0] == 'Indian' || $zoneExploded[0] == 'Pacific')
    {        
        if (isset($zoneExploded[1]) != '')
        {
            $area = str_replace('_', ' ', $zoneExploded[1]);
            
            if (!empty($zoneExploded[2]))
            {
            	$area = $area . ' (' . str_replace('_', ' ', $zoneExploded[2]) . ')';
            }
            
            $locations[$zoneExploded[0]][$zone] = $area; // Creates array(DateTimeZone => 'Friendly name')
        } 
    }
}
?>

The $locations array will contain a multi-dimensional array for each continent like

Array
(
    [Africa] => Array
        (
            [Africa/Abidjan] => Abidjan
            [Africa/Accra] => Accra
            [Africa/Addis_Ababa] => Addis Ababa
            [Africa/Algiers] => Algiers
            ...
        )
    [America] => Array
        (
            [America/Adak] => Adak
            [America/Anchorage] => Anchorage
            [America/Anguilla] => Anguilla
            ...