PHP - 将时区列为过滤列表

Question

正在查看此问题here，我用@Toland Hon的答案来生成时区列表。该列表是巨大的（我得到一个420值的数组）。有没有办法将列表的大小缩小到重要的时区？

下面是一个例子，我从网站得到的，

<option value="American Samoa">(GMT-11:00) American Samoa</option> 
<option value="International Date Line West">(GMT-11:00) International Date Line West</option> 
<option value="Midway Island">(GMT-11:00) Midway Island</option> 
<option value="Hawaii">(GMT-10:00) Hawaii</option> 
<option value="Alaska">(GMT-09:00) Alaska</option> 
<option value="America/Los_Angeles">(GMT-08:00) America/Los_Angeles</option> 
<option value="Pacific Time (US &amp; Canada)">(GMT-08:00) Pacific Time (US &amp; Canada)</option> 
<option value="Tijuana">(GMT-08:00) Tijuana</option> 
<option value="Arizona">(GMT-07:00) Arizona</option> 
<option value="Chihuahua">(GMT-07:00) Chihuahua</option> 
<option value="Mazatlan">(GMT-07:00) Mazatlan</option> 
<option value="Mountain Time (US &amp; Canada)">(GMT-07:00) Mountain Time (US &amp; Canada)</option> 
<option value="Central America">(GMT-06:00) Central America</option> 
<option value="Central Time (US &amp; Canada)">(GMT-06:00) Central Time (US &amp; Canada)</option> 
<option value="Guadalajara">(GMT-06:00) Guadalajara</option> 
<option value="Mexico City">(GMT-06:00) Mexico City</option> 
<option value="Monterrey">(GMT-06:00) Monterrey</option> 
<option value="Saskatchewan">(GMT-06:00) Saskatchewan</option> 
<option value="America/New_York">(GMT-05:00) America/New_York</option> 
<option value="America/Toronto">(GMT-05:00) America/Toronto</option> 
<option value="Bogota">(GMT-05:00) Bogota</option> 
<option value="Eastern Time (US &amp; Canada)">(GMT-05:00) Eastern Time (US &amp; Canada)</option> 
<option value="Indiana (East)">(GMT-05:00) Indiana (East)</option> 
<option value="Lima">(GMT-05:00) Lima</option> 
<option value="Quito">(GMT-05:00) Quito</option> 
<option value="Atlantic Time (Canada)">(GMT-04:00) Atlantic Time (Canada)</option> 
<option value="Caracas">(GMT-04:00) Caracas</option> 
<option value="Georgetown">(GMT-04:00) Georgetown</option> 
<option value="La Paz">(GMT-04:00) La Paz</option> 
<option value="Santiago">(GMT-04:00) Santiago</option> 
<option value="Newfoundland">(GMT-03:30) Newfoundland</option> 
<option value="Brasilia">(GMT-03:00) Brasilia</option> 
<option value="Buenos Aires">(GMT-03:00) Buenos Aires</option> 
<option value="Greenland">(GMT-03:00) Greenland</option> 
<option value="Montevideo">(GMT-03:00) Montevideo</option> 
<option value="Mid-Atlantic">(GMT-02:00) Mid-Atlantic</option> 
<option value="Azores">(GMT-01:00) Azores</option> 
<option value="Cape Verde Is.">(GMT-01:00) Cape Verde Is.</option> 
<option value="Casablanca">(GMT+00:00) Casablanca</option> 
<option value="Dublin">(GMT+00:00) Dublin</option> 
<option value="Edinburgh">(GMT+00:00) Edinburgh</option> 
<option value="Europe/Lisbon">(GMT+00:00) Europe/Lisbon</option> 
<option value="Europe/London">(GMT+00:00) Europe/London</option> 
<option value="Lisbon">(GMT+00:00) Lisbon</option> 
<option value="London">(GMT+00:00) London</option> 
<option value="Monrovia">(GMT+00:00) Monrovia</option> 
<option value="UTC">(GMT+00:00) UTC</option> 
<option value="Amsterdam">(GMT+01:00) Amsterdam</option> 
<option value="Belgrade">(GMT+01:00) Belgrade</option> 
<option value="Berlin">(GMT+01:00) Berlin</option> 
<option value="Bern">(GMT+01:00) Bern</option> 
<option value="Bratislava">(GMT+01:00) Bratislava</option> 
<option value="Brussels">(GMT+01:00) Brussels</option> 
<option value="Budapest">(GMT+01:00) Budapest</option> 
<option value="Copenhagen">(GMT+01:00) Copenhagen</option> 
<option value="Ljubljana">(GMT+01:00) Ljubljana</option> 
<option value="Madrid">(GMT+01:00) Madrid</option> 
<option value="Paris">(GMT+01:00) Paris</option> 
<option value="Prague">(GMT+01:00) Prague</option> 
<option value="Rome">(GMT+01:00) Rome</option> 
<option value="Sarajevo">(GMT+01:00) Sarajevo</option> 
<option value="Skopje">(GMT+01:00) Skopje</option> 
<option value="Stockholm">(GMT+01:00) Stockholm</option> 
<option value="Vienna">(GMT+01:00) Vienna</option> 
<option value="Warsaw">(GMT+01:00) Warsaw</option> 
<option value="West Central Africa">(GMT+01:00) West Central Africa</option> 
<option value="Zagreb">(GMT+01:00) Zagreb</option> 
<option value="Athens">(GMT+02:00) Athens</option> 
<option value="Bucharest">(GMT+02:00) Bucharest</option> 
<option value="Cairo">(GMT+02:00) Cairo</option> 
<option value="Harare">(GMT+02:00) Harare</option> 
<option value="Helsinki">(GMT+02:00) Helsinki</option> 
<option value="Jerusalem">(GMT+02:00) Jerusalem</option> 
<option value="Kaliningrad">(GMT+02:00) Kaliningrad</option> 
<option value="Kyiv">(GMT+02:00) Kyiv</option> 
<option value="Pretoria">(GMT+02:00) Pretoria</option> 
<option value="Riga">(GMT+02:00) Riga</option> 
<option value="Sofia">(GMT+02:00) Sofia</option> 
<option value="Tallinn">(GMT+02:00) Tallinn</option> 
<option value="Vilnius">(GMT+02:00) Vilnius</option> 
<option value="Baghdad">(GMT+03:00) Baghdad</option> 
<option value="Istanbul">(GMT+03:00) Istanbul</option> 
<option value="Kuwait">(GMT+03:00) Kuwait</option> 
<option value="Minsk">(GMT+03:00) Minsk</option> 
<option value="Moscow">(GMT+03:00) Moscow</option> 
<option value="Nairobi">(GMT+03:00) Nairobi</option> 
<option value="Riyadh">(GMT+03:00) Riyadh</option> 
<option value="St. Petersburg">(GMT+03:00) St. Petersburg</option> 
<option value="Volgograd">(GMT+03:00) Volgograd</option> 
<option value="Tehran">(GMT+03:30) Tehran</option> 
<option value="Abu Dhabi">(GMT+04:00) Abu Dhabi</option> 
<option value="Baku">(GMT+04:00) Baku</option> 
<option value="Muscat">(GMT+04:00) Muscat</option> 
<option value="Samara">(GMT+04:00) Samara</option> 
<option value="Tbilisi">(GMT+04:00) Tbilisi</option> 
<option value="Yerevan">(GMT+04:00) Yerevan</option> 
<option value="Kabul">(GMT+04:30) Kabul</option> 
<option value="Ekaterinburg">(GMT+05:00) Ekaterinburg</option> 
<option value="Islamabad">(GMT+05:00) Islamabad</option> 
<option value="Karachi">(GMT+05:00) Karachi</option> 
<option value="Tashkent">(GMT+05:00) Tashkent</option> 
<option value="Chennai">(GMT+05:30) Chennai</option> 
<option value="Kolkata">(GMT+05:30) Kolkata</option> 
<option value="Mumbai">(GMT+05:30) Mumbai</option> 
<option value="New Delhi">(GMT+05:30) New Delhi</option> 
<option value="Sri Jayawardenepura">(GMT+05:30) Sri Jayawardenepura</option> 
<option value="Kathmandu">(GMT+05:45) Kathmandu</option> 
<option value="Almaty">(GMT+06:00) Almaty</option> 
<option value="Astana">(GMT+06:00) Astana</option> 
<option value="Dhaka">(GMT+06:00) Dhaka</option> 
<option value="Urumqi">(GMT+06:00) Urumqi</option> 
<option value="Rangoon">(GMT+06:30) Rangoon</option> 
<option value="Bangkok">(GMT+07:00) Bangkok</option> 
<option value="Hanoi">(GMT+07:00) Hanoi</option> 
<option value="Jakarta">(GMT+07:00) Jakarta</option> 
<option value="Krasnoyarsk">(GMT+07:00) Krasnoyarsk</option> 
<option value="Novosibirsk">(GMT+07:00) Novosibirsk</option> 
<option value="Beijing">(GMT+08:00) Beijing</option> 
<option value="Chongqing">(GMT+08:00) Chongqing</option> 
<option value="Hong Kong">(GMT+08:00) Hong Kong</option> 
<option value="Irkutsk">(GMT+08:00) Irkutsk</option> 
<option selected="selected" value="Kuala Lumpur">(GMT+08:00) Kuala Lumpur</option> 
<option value="Perth">(GMT+08:00) Perth</option> 
<option value="Singapore">(GMT+08:00) Singapore</option> 
<option value="Taipei">(GMT+08:00) Taipei</option> 
<option value="Ulaanbaatar">(GMT+08:00) Ulaanbaatar</option> 
<option value="Osaka">(GMT+09:00) Osaka</option> 
<option value="Sapporo">(GMT+09:00) Sapporo</option> 
<option value="Seoul">(GMT+09:00) Seoul</option> 
<option value="Tokyo">(GMT+09:00) Tokyo</option> 
<option value="Yakutsk">(GMT+09:00) Yakutsk</option> 
<option value="Adelaide">(GMT+09:30) Adelaide</option> 
<option value="Darwin">(GMT+09:30) Darwin</option> 
<option value="Brisbane">(GMT+10:00) Brisbane</option> 
<option value="Canberra">(GMT+10:00) Canberra</option> 
<option value="Guam">(GMT+10:00) Guam</option> 
<option value="Hobart">(GMT+10:00) Hobart</option> 
<option value="Melbourne">(GMT+10:00) Melbourne</option> 
<option value="Port Moresby">(GMT+10:00) Port Moresby</option> 
<option value="Sydney">(GMT+10:00) Sydney</option> 
<option value="Vladivostok">(GMT+10:00) Vladivostok</option> 
<option value="Magadan">(GMT+11:00) Magadan</option> 
<option value="New Caledonia">(GMT+11:00) New Caledonia</option> 
<option value="Solomon Is.">(GMT+11:00) Solomon Is.</option> 
<option value="Srednekolymsk">(GMT+11:00) Srednekolymsk</option> 
<option value="Auckland">(GMT+12:00) Auckland</option> 
<option value="Fiji">(GMT+12:00) Fiji</option> 
<option value="Kamchatka">(GMT+12:00) Kamchatka</option> 
<option value="Marshall Is.">(GMT+12:00) Marshall Is.</option> 
<option value="Wellington">(GMT+12:00) Wellington</option> 
<option value="Chatham Is.">(GMT+12:45) Chatham Is.</option> 
<option value="Nuku'alofa">(GMT+13:00) Nuku'alofa</option> 
<option value="Samoa">(GMT+13:00) Samoa</option> 
<option value="Tokelau Is.">(GMT+13:00) Tokelau Is.</option> 

他们只列出154个时区。从我在StackOverflow中读到的内容来看，使用静态列表并不好，所以我不打算创建一个静态列表。

这是个好主意，如果我做了一个数组，$timezoneList，与我需要的时区的名称，并显示一个下拉菜单给用户的时候，我可能会产生使用$timezoneList和DateTimeZone->getOffset偏移正确的阵列？

Answer 1

这是我的解决方案。我有一个带有时区标识符和显示（用于前端使用）的硬编码数组，用于生成具有正确偏移显示的数组。

static function generateTimeZoneList() 
    { 
     static $timezone_list; 

     if(!isset($timezone_list) || empty($timezone_list)) 
     { 
      $identifiers = self::getIdentifiers(); //get identifiers list 

      $temp_list = array(); 
      foreach($identifiers as $timezone => $display) 
      { 
       $tz = new DateTimeZone($timezone); 
       $temp_list[$timezone] = $tz->getOffset(new DateTime); 
      } 
      // sort timezone by offset 
      asort($temp_list); 

      foreach($temp_list as $timezone => $offset) 
      { 
       $offset_prefix = $offset < 0 ? '-' : '+'; 
       $offset_formatted = gmdate('H:i', abs($offset)); 

       $pretty_offset = "GMT${offset_prefix}${offset_formatted}"; 

       $display = $identifiers[$timezone]; 
       $timezone_list[$timezone] = "($pretty_offset) $display"; 
      } 
     } 
     return $timezone_list; 
    } 

    /** 
    * Format: identifier => display name 
    */ 
    static function getIdentifiers() 
    { 
     static $identifiers = array(
      "Africa/Cairo" => " Cairo", 
      "Africa/Casablanca" => " Casablanca", 
      "Africa/Harare" => " Harare", 
      "Africa/Johannesburg" => " Pretoria", 
      "Africa/Lagos" => " West Central Africa", 
      "Africa/Monrovia" => " Monrovia", 
      "Africa/Nairobi" => " Nairobi", 
      "America/Argentina/Buenos_Aires" => " Buenos Aires", 
      "America/Argentina/Buenos_Aires" => " Georgetown", 
      "America/Bogota" => " Quito", 
      "America/Bogota" => " Bogota", 
      "America/Caracas" => " Caracas", 
      "America/Chihuahua" => " La Paz", 
      "America/Chihuahua" => " Chihuahua", 
      "America/Godthab" => " Greenland", 
      "America/La_Paz" => " La Paz", 
      "America/Lima" => " Lima", 
      "America/Los_Angeles" => " Pacific Time (US & Canada)", 
      "America/Managua" => " Central America", 
      "America/Mazatlan" => " Mazatlan", 
      "America/Mexico_City" => " Mexico City", 
      "America/Mexico_City" => " Guadalajara", 
      "America/Monterrey" => " Monterrey", 
      "America/Noronha" => " Mid-Atlantic", 
      "America/Santiago" => " Santiago", 
      "America/Sao_Paulo" => " Brasilia", 
      "America/Tijuana" => " Tijuana", 
      "Asia/Almaty" => " Almaty", 
      "Asia/Baghdad" => " Baghdad", 
      "Asia/Baku" => " Baku", 
      "Asia/Bangkok" => " Hanoi", 
      "Asia/Bangkok" => " Bangkok", 
      "Asia/Calcutta" => " Chennai", 
      "Asia/Calcutta" => " Mumbai", 
      "Asia/Calcutta" => " New Delhi", 
      "Asia/Calcutta" => " Sri Jayawardenepura", 
      "Asia/Chongqing" => " Chongqing", 
      "Asia/Dhaka" => " Dhaka", 
      "Asia/Dhaka" => " Astana", 
      "Asia/Hong_Kong" => " Beijing", 
      "Asia/Hong_Kong" => " Hong Kong", 
      "Asia/Irkutsk" => " Irkutsk", 
      "Asia/Jakarta" => " Jakarta", 
      "Asia/Jerusalem" => " Jerusalem", 
      "Asia/Kabul" => " Kabul", 
      "Asia/Kamchatka" => " Kamchatka", 
      "Asia/Karachi" => " Karachi", 
      "Asia/Karachi" => " Islamabad", 
      "Asia/Katmandu" => " Kathmandu", 
      "Asia/Kolkata" => " Kolkata", 
      "Asia/Krasnoyarsk" => " Krasnoyarsk", 
      "Asia/Kuala_Lumpur" => " Kuala Lumpur", 
      "Asia/Kuwait" => " Kuwait", 
      "Asia/Magadan" => " Solomon Is.", 
      "Asia/Magadan" => " Magadan", 
      "Asia/Magadan" => " New Caledonia", 
      "Asia/Muscat" => " Abu Dhabi", 
      "Asia/Muscat" => " Muscat", 
      "Asia/Novosibirsk" => " Novosibirsk", 
      "Asia/Rangoon" => " Rangoon", 
      "Asia/Riyadh" => " Riyadh", 
      "Asia/Seoul" => " Seoul", 
      "Asia/Singapore" => " Singapore", 
      "Asia/Taipei" => " Taipei", 
      "Asia/Tashkent" => " Tashkent", 
      "Asia/Tbilisi" => " Tbilisi", 
      "Asia/Tehran" => " Tehran", 
      "Asia/Tokyo" => " Osaka", 
      "Asia/Tokyo" => " Tokyo", 
      "Asia/Tokyo" => " Sapporo", 
      "Asia/Ulan_Bator" => " Ulaan Bataar", 
      "Asia/Urumqi" => " Urumqi", 
      "Asia/Vladivostok" => " Vladivostok", 
      "Asia/Yakutsk" => " Yakutsk", 
      "Asia/Yekaterinburg" => " Ekaterinburg", 
      "Asia/Yerevan" => " Yerevan", 
      "Atlantic/Azores" => " Azores", 
      "Atlantic/Cape_Verde" => " Cape Verde Is.", 
      "Australia/Adelaide" => " Adelaide", 
      "Australia/Brisbane" => " Brisbane", 
      "Australia/Canberra" => " Canberra", 
      "Australia/Darwin" => " Darwin", 
      "Australia/Hobart" => " Hobart", 
      "Australia/Melbourne" => " Melbourne", 
      "Australia/Perth" => " Perth", 
      "Australia/Sydney" => " Sydney", 
      "Canada/Atlantic" => " Atlantic Time (Canada)", 
      "Canada/Newfoundland" => " Newfoundland", 
      "Canada/Saskatchewan" => " Saskatchewan", 
      "Etc/Greenwich" => " Greenwich Mean Time : Dublin", 
      "Europe/Amsterdam" => " Amsterdam", 
      "Europe/Athens" => " Athens", 
      "Europe/Belgrade" => " Belgrade", 
      "Europe/Berlin" => " Berlin", 
      "Europe/Berlin" => " Bern", 
      "Europe/Bratislava" => " Bratislava", 
      "Europe/Brussels" => " Brussels", 
      "Europe/Bucharest" => " Bucharest", 
      "Europe/Budapest" => " Budapest", 
      "Europe/Copenhagen" => " Copenhagen", 
      "Europe/Helsinki" => " Helsinki", 
      "Europe/Helsinki" => " Kyiv", 
      "Europe/Istanbul" => " Istanbul", 
      "Europe/Lisbon" => " Lisbon", 
      "Europe/Ljubljana" => " Ljubljana", 
      "Europe/London" => " Edinburgh", 
      "Europe/London" => " London", 
      "Europe/Madrid" => " Madrid", 
      "Europe/Minsk" => " Minsk", 
      "Europe/Moscow" => " St. Petersburg", 
      "Europe/Moscow" => " Moscow", 
      "Europe/Paris" => " Paris", 
      "Europe/Prague" => " Prague", 
      "Europe/Riga" => " Riga", 
      "Europe/Rome" => " Rome", 
      "Europe/Sarajevo" => " Sarajevo", 
      "Europe/Skopje" => " Skopje", 
      "Europe/Sofia" => " Sofia", 
      "Europe/Stockholm" => " Stockholm", 
      "Europe/Tallinn" => " Tallinn", 
      "Europe/Vienna" => " Vienna", 
      "Europe/Vilnius" => " Vilnius", 
      "Europe/Volgograd" => " Volgograd", 
      "Europe/Warsaw" => " Warsaw", 
      "Europe/Zagreb" => " Zagreb", 
      "Pacific/Auckland" => " Wellington", 
      "Pacific/Auckland" => " Auckland", 
      "Pacific/Fiji" => " Fiji", 
      "Pacific/Fiji" => " Marshall Is.", 
      "Pacific/Guam" => " Guam", 
      "Pacific/Honolulu" => " Hawaii", 
      "Pacific/Kwajalein" => " International Date Line West", 
      "Pacific/Midway" => " Midway Island", 
      "Pacific/Port_Moresby" => " Port Moresby", 
      "Pacific/Samoa" => " Samoa", 
      "Pacific/Tongatapu" => " Nuku'alofa", 
      "US/Alaska" => " Alaska", 
      "US/Arizona" => " Arizona", 
      "US/Central" => " Central Time (US & Canada)", 
      "US/East-Indiana" => " Indiana (East)", 
      "US/Eastern" => " Eastern Time (US & Canada)", 
      "US/Mountain" => " Mountain Time (US & Canada)", 
      "UTC" => " UTC" 
     ); 

     return $identifiers; 
    } 

结果看起来与此类似，

array (size=121) 
    'Pacific/Midway' => string '(GMT-11:00) Midway Island' (length=26) 
    'Pacific/Samoa' => string '(GMT-11:00) Samoa' (length=18) 
    'Pacific/Honolulu' => string '(GMT-10:00) Hawaii' (length=19) 
    'US/Alaska' => string '(GMT-08:00) Alaska' (length=19) 
    'America/Los_Angeles' => string '(GMT-07:00) Pacific Time (US & Canada)' (length=39) 
    'US/Arizona' => string '(GMT-07:00) Arizona' (length=20) 
    'America/Tijuana' => string '(GMT-07:00) Tijuana' (length=20) 
    'Canada/Saskatchewan' => string '(GMT-06:00) Saskatchewan' (length=25) 
    'America/Managua' => string '(GMT-06:00) Central America' (length=28) 
    'America/Mazatlan' => string '(GMT-06:00) Mazatlan' (length=21) 
    'America/Chihuahua' => string '(GMT-06:00) Chihuahua' (length=22) 
    'US/Mountain' => string '(GMT-06:00) Mountain Time (US & Canada)' (length=40) 
    'America/Lima' => string '(GMT-05:00) Lima' (length=17)