How to generate a drop down list of timezone using PHP ?

11 Oct, 2019
The timezone_identifiers_list() function is used to generate a dropdown list of timezone with PHP. This function is used to return an indexed array containing all the timezone identifiers. The datetimezone object is sent as a parameter to the timezone_identifiers_list() function and it returns an indexed array on success or False on failure. This function is an alias of DateTimeZone::listIdentifiers() function.The timezone_identifiers_list() function uses its timezone constants and country to display a list of timezone independently.Such that the possible values for timezone constants are:
1 = AFRICA | 2 = AMERICA | 4 = ANTARCTICA | 8 = ARCTIC | 16 = ASIA | 32 = ATLANTIC | 64 = AUSTRALIA | 128 = EUROPE | 256 = INDIAN | 512 = PACIFIC | 1024 = UTC | 2047 = ALL | 4095 = ALL_WITH_BC | 4096 = PER_COUNTRY
Syntax:
array timezone_identifiers_list( int $datetimezone, string $country )
Example 1: This example illustrates how to select the timezone listed in dropdown using timezone identifiers.
<?php  function select_Timezone($selected = '') {      // Create a list of timezone    $OptionsArray = timezone_identifiers_list();        $select= '<select name="SelectContacts">                    <option disabled selected>                        Please Select Timezone                    </option>';                  while (list ($key, $row) = each ($OptionsArray) ){            $select .='<option value="'.$key.'"';            $select .= ($key == $selected ? : '');            $select .= '>'.$row.'</option>';        }                   $select.='</select>';    return $select;}  echo select_Timezone() . '<br>';  ?>
Output:
Example 2: This example illustrates how to select the timezone listed in dropdown using timezone identifiers.
<?php  // Create a timezone identifiers$timezone_identifiers =     DateTimeZone::listIdentifiers(DateTimeZone::ALL);  echo "<select>";  echo "<option disabled selected>         Please Select Timezone      </option>";  $n = 425;for($i = 0; $i < $n; $i++) {          // Print the timezone identifiers    echo "<option value='" . $timezone_identifiers[$i] .         "'>" . $timezone_identifiers[$i] . "</option>";}  echo "</select>";  ?>
Output:
Example 3: This example illustrates the dropdown with list of TimeZone using DateTimeZone::listIdentifiers (DateTimeZone::ALL) along with range() function.
<?php  $timezone_identifiers =     DateTimeZone::listIdentifiers(DateTimeZone::ALL);  $Africa = range(0, 51);$America = range(52, 198);$Asia = range(211, 292);$tz_stamp = time();  echo "<center><select style='padding:20px;     font-family: Courier New, Courier, monospace;     width: 450px;border:2px solid #a09;     outline: none;'>";  echo "<option style='color:#FFF;font-family:Cambria;          background-color:#a09;'><h3>Africa</h3>      </option>";  foreach($Africa as $x) {     $tzone[$x] = date_default_timezone_set(                        $timezone_identifiers[$x]);          echo "<option>" . $timezone_identifiers[$x] .            ' @ ' . date('P', $tz_stamp);"</option>";}  echo "<option style='color:#FFF;font-family:Cambria;        background-color:#a09;font-size:15px;'>        <h3>America</h3></option>";  foreach($America as $x) {     $tzone[$x] = date_default_timezone_set(                        $timezone_identifiers[$x]);          echo "<option>" . $timezone_identifiers[$x] .             ' @ ' . date('P', $tz_stamp);"</option>";}  echo "<option style='color:#FFF;font-family:Cambria;        background-color:#a09;font-size:15px;'>        <h3>Asia</h3></option>";          foreach($Asia as $x) {     $tzone[$x] = date_default_timezone_set(                        $timezone_identifiers[$x]);      echo "<option>" . $timezone_identifiers[$x] .            ' @ ' . date('P', $tz_stamp);"</option>";}  echo "</select></center>";?>
Output:
Reference: https://www.php.net/manual/en/function.timezone-identifiers-list.php
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