Using PHP's listidentifiers 
(part of the DateTimeZone class ), we can create a dropdown menu of all available global timezone identifiers. It's handy for inclusion in forms if you're after a general region rather than just country.
The first function retrieves timezone values and returns an array:
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<?php
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/*
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Get Global Timezones/Locations in Dropdown Select Menu
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http://www.beliefmedia.com/code/php-snippets/timezone-select-menu
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*/
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function beliefmedia_get_timezones() {
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$o = array();
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foreach($t_zones as $a) {
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$t = '';
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try {
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/* Throws exception for 'US/Pacific-New' */
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$zone = new DateTimeZone($a);
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$seconds = $zone->getOffset( new DateTime('now', $zone) );
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$t = $a . ' [ ' . $hours . ':' . $minutes . ' ]';
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$o[$a] = $t;
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}
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/* Exceptions must be catched, else a blank page */
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catch(Exception $e) {
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/* die("Exception : " . $e->getMessage() . ''); */
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}
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}
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/* Sort array by key */
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ksort($o);
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return $o;
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}
The second function retrieves the timezone array and manufactures the select menu.
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<?php
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/*
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Get Global Timezones/Locations in Dropdown Select Menu
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http://www.beliefmedia.com/code/php-snippets/timezone-select-menu
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*/
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/* Get timezones */
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$o = beliefmedia_get_timezones();
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foreach($o as $tz => $label) {
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$return .= '<option value="' . $tz . '">' . $label . '</option>';
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}
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return '<select name="timezone" style="height: 30px; font-size: 1.0em;">' . $return . '</select>';
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}
Usage is as follows:
/* Usage */ echo beliefmedia_timezones();
The results is as follows:
Note: I've included raw HTML to show the list so timezone values may not be correct.
