<?php
$date = new DateTimeImmutable("now", new DateTimeZone('Europe/London'));
$tz = $date->getTimezone();
echo $tz->getName();
The above example will output:
<?php
$date = date_create("now", timezone_open('Europe/London'));
$tz = date_timezone_get($date);
echo timezone_name_get($tz);
The above example will output: