The perfect TimeZone selectbox list for PHP 5.3+
<?php
$regions = array(
'Africa' => DateTimeZone::AFRICA,
'America' => DateTimeZone::AMERICA,
'Antarctica' => DateTimeZone::ANTARCTICA,
'Aisa' => DateTimeZone::ASIA,
'Atlantic' => DateTimeZone::ATLANTIC,
'Europe' => DateTimeZone::EUROPE,
'Indian' => DateTimeZone::INDIAN,
'Pacific' => DateTimeZone::PACIFIC
);
$timezones = array();
foreach ($regions as $name => $mask)
{
$zones = DateTimeZone::listIdentifiers($mask);
foreach($zones as $timezone)
{
// Lets sample the time there right now
$time = new DateTime(NULL, new DateTimeZone($timezone));
// Us dumb Americans can't handle millitary time
$ampm = $time->format('H') > 12 ? ' ('. $time->format('g:i a'). ')' : '';
// Remove region name and add a sample time
$timezones[$name][$timezone] = substr($timezone, strlen($name) + 1) . ' - ' . $time->format('H:i') . $ampm;
}
}
// View
print '<label>Select Your Timezone</label><select id="timezone">';
foreach($timezones as $region => $list)
{
print '<optgroup label="' . $region . '">' . "\n";
foreach($list as $timezone => $name)
{
print '<option name="' . $timezone . '">' . $name . '</option>' . "\n";
}
print '<optgroup>' . "\n";
}
print '</select>';