PHP | timezone_identifiers_list() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP timezone_identifiers_list() Function.

The timezone_identifiers_list() function is an alias of DateTimeZone::listIdentifiers(). It returns all the identifiers in PHP in form of an array.

Syntax

Following below is the syntax to use this function -

timezone_identifiers_list([$what, $country])

READ: PHP | time() Function

Parameter Details

Sr.No	Parameter & Description
1	what (Optional) This is an integer value specifying the DateTimeZone class constant representing a continent.
2	what (Optional) This is a string value representing a country code(ISO 3166-1).

Return Value

This built-in PHP function returns an array containing the list of timezone identifiers. In the case of failure, this function returns the boolean value false.

PHP Version

This function was first introduced as part of core PHP v 5.2.0 and, it works with all the later versions.

Example1

Below example shows the usage of PHP timezone_identifiers_list() function -

<?php
   print($timeZone[201]."\n");
   print($timeZone[202]."\n");
   print($timeZone[203]."\n");
   print($timeZone[204]."\n");
   print($timeZone[205]."\n");
   print($timeZone[206]."\n");
   print($timeZone[207]."\n");
   print($timeZone[208]."\n");
?>

Output

When the above code is executed, it will produce the following result -

Antarctica/DumontDUrville
Antarctica/Macquarie
Antarctica/Mawson
Antarctica/McMurdo
Antarctica/Palmer
Antarctica/Rothera
Antarctica/Syowa
Antarctica/Troll

Example2

Try the following example -

$timezone_identifiers = DateTimeZone::listIdentifiers();
for ($i = 0; $i < 5; $i++) {
   echo "$timezone_identifiers[$i]\n";
}
   
echo "-------------------------------------------------\n";
$timezone_identifiers = timezone_identifiers_list();
   
for ($i = 0; $i < 5; $i++) {
   echo "$timezone_identifiers[$i]\n";
}

Output

When the above code is executed, it will produce the following result -

Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara
-------------------------------------------------
Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara

READ: PHP | date_sunset() Function

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the php timezone_name_from_abbr() Function.

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