+function wp_timezone_choice( $selected_zone ) {
+ static $mo_loaded = false;
+
+ $continents = array( 'Africa', 'America', 'Antarctica', 'Arctic', 'Asia', 'Atlantic', 'Australia', 'Europe', 'Indian', 'Pacific');
+
+ // Load translations for continents and cities
+ if ( !$mo_loaded ) {
+ $locale = get_locale();
+ $mofile = WP_LANG_DIR . '/continents-cities-' . $locale . '.mo';
+ load_textdomain( 'continents-cities', $mofile );
+ $mo_loaded = true;
+ }
+
+ $zonen = array();
+ foreach ( timezone_identifiers_list() as $zone ) {
+ $zone = explode( '/', $zone );
+ if ( !in_array( $zone[0], $continents ) ) {
+ continue;
+ }
+
+ // This determines what gets set and translated - we don't translate Etc/* strings here, they are done later
+ $exists = array(
+ 0 => ( isset( $zone[0] ) && $zone[0] ),
+ 1 => ( isset( $zone[1] ) && $zone[1] ),
+ 2 => ( isset( $zone[2] ) && $zone[2] ),
+ );
+ $exists[3] = ( $exists[0] && 'Etc' !== $zone[0] );
+ $exists[4] = ( $exists[1] && $exists[3] );
+ $exists[5] = ( $exists[2] && $exists[3] );
+
+ $zonen[] = array(
+ 'continent' => ( $exists[0] ? $zone[0] : '' ),
+ 'city' => ( $exists[1] ? $zone[1] : '' ),
+ 'subcity' => ( $exists[2] ? $zone[2] : '' ),
+ 't_continent' => ( $exists[3] ? translate( str_replace( '_', ' ', $zone[0] ), 'continents-cities' ) : '' ),
+ 't_city' => ( $exists[4] ? translate( str_replace( '_', ' ', $zone[1] ), 'continents-cities' ) : '' ),
+ 't_subcity' => ( $exists[5] ? translate( str_replace( '_', ' ', $zone[2] ), 'continents-cities' ) : '' )
+ );
+ }
+ usort( $zonen, '_wp_timezone_choice_usort_callback' );
+
+ $structure = array();
+
+ if ( empty( $selected_zone ) ) {
+ $structure[] = '<option selected="selected" value="">' . __( 'Select a city' ) . '</option>';
+ }
+
+ foreach ( $zonen as $key => $zone ) {
+ // Build value in an array to join later
+ $value = array( $zone['continent'] );
+
+ if ( empty( $zone['city'] ) ) {
+ // It's at the continent level (generally won't happen)
+ $display = $zone['t_continent'];
+ } else {
+ // It's inside a continent group
+
+ // Continent optgroup
+ if ( !isset( $zonen[$key - 1] ) || $zonen[$key - 1]['continent'] !== $zone['continent'] ) {
+ $label = $zone['t_continent'];
+ $structure[] = '<optgroup label="'. esc_attr( $label ) .'">';
+ }
+
+ // Add the city to the value
+ $value[] = $zone['city'];
+
+ $display = $zone['t_city'];
+ if ( !empty( $zone['subcity'] ) ) {
+ // Add the subcity to the value
+ $value[] = $zone['subcity'];
+ $display .= ' - ' . $zone['t_subcity'];
+ }
+ }
+
+ // Build the value
+ $value = join( '/', $value );
+ $selected = '';
+ if ( $value === $selected_zone ) {
+ $selected = 'selected="selected" ';
+ }
+ $structure[] = '<option ' . $selected . 'value="' . esc_attr( $value ) . '">' . esc_html( $display ) . "</option>";
+
+ // Close continent optgroup
+ if ( !empty( $zone['city'] ) && ( !isset($zonen[$key + 1]) || (isset( $zonen[$key + 1] ) && $zonen[$key + 1]['continent'] !== $zone['continent']) ) ) {
+ $structure[] = '</optgroup>';
+ }
+ }
+
+ // Do UTC
+ $structure[] = '<optgroup label="'. esc_attr__( 'UTC' ) .'">';
+ $selected = '';
+ if ( 'UTC' === $selected_zone )
+ $selected = 'selected="selected" ';
+ $structure[] = '<option ' . $selected . 'value="' . esc_attr( 'UTC' ) . '">' . __('UTC') . '</option>';
+ $structure[] = '</optgroup>';
+
+ // Do manual UTC offsets
+ $structure[] = '<optgroup label="'. esc_attr__( 'Manual Offsets' ) .'">';
+ $offset_range = array (-12, -11.5, -11, -10.5, -10, -9.5, -9, -8.5, -8, -7.5, -7, -6.5, -6, -5.5, -5, -4.5, -4, -3.5, -3, -2.5, -2, -1.5, -1, -0.5,
+ 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 5.75, 6, 6.5, 7, 7.5, 8, 8.5, 8.75, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.75, 13, 13.75, 14);
+ foreach ( $offset_range as $offset ) {
+ if ( 0 <= $offset )
+ $offset_name = '+' . $offset;
+ else
+ $offset_name = (string) $offset;
+
+ $offset_value = $offset_name;
+ $offset_name = str_replace(array('.25','.5','.75'), array(':15',':30',':45'), $offset_name);
+ $offset_name = 'UTC' . $offset_name;
+ $offset_value = 'UTC' . $offset_value;
+ $selected = '';
+ if ( $offset_value === $selected_zone )
+ $selected = 'selected="selected" ';
+ $structure[] = '<option ' . $selected . 'value="' . esc_attr( $offset_value ) . '">' . esc_html( $offset_name ) . "</option>";
+
+ }
+ $structure[] = '</optgroup>';
+
+ return join( "\n", $structure );