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

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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>"; 
?> 