(PHP 5 >= 5.2.0, PHP 7)
DateTimeZone::listAbbreviations -- timezone_abbreviations_list — Returns associative array containing dst, offset and the timezone name
Object oriented style
Procedural style
   Returns array on success or FALSE on failure.
  
Example #1 A timezone_abbreviations_list() example
<?php
$timezone_abbreviations = DateTimeZone::listAbbreviations();
print_r($timezone_abbreviations["acst"]);
?>
The above example will output something similar to:
Array
(
    [0] => Array
        (
            [dst] => 1
            [offset] => -14400
            [timezone_id] => America/Porto_Acre
        )
    [1] => Array
        (
            [dst] => 1
            [offset] => -14400
            [timezone_id] => America/Eirunepe
        )
    [2] => Array
        (
            [dst] => 1
            [offset] => -14400
            [timezone_id] => America/Rio_Branco
        )
    [3] => Array
        (
            [dst] => 1
            [offset] => -14400
            [timezone_id] => Brazil/Acre
        )
)