[php-src] Issue #12052: Time Zone Un-Abbreviated Names

Issue: https://github.com/php/php-src/issues/12052 Author: jack-worman ### Description Currently, there is only support for abbreviated time zone names. To get the un-abbreviated time zone name, I have to maintain my own mappings: ```php const TIME_ZONE_ABBREVIATION_TO_NAME_MAP = [ 'HDT' => 'Hawaii-Aleutian Daylight Time', 'HST' => 'Hawaii Standard Time', 'AKDT' => 'Alaska Daylight Time', 'AKST' => 'Alaska Standard Time', 'MDT' => 'Mountain Daylight Time', 'MST' => 'Mountain Standard Time', 'CDT' => 'Central Daylight Time', 'CST' => 'Central Standard Time', 'EDT' => 'Eastern Daylight Time', 'EST' => 'Eastern Standard Time', 'PDT' => 'Pacific Daylight Time', 'PST' => 'Pacific Standard Time', 'AST' => 'Atlantic Standard Time', 'ChST' => 'Chamorro Standard Time', // ... ]; ``` Of course, this is not optimal. I am requesting that DateTimeInterface::format() and related functions have a format character for the un-abbreviated time zone and DateTimeZone::getTransitions() adds an "un-abbr" offset to the list of transitions returned. ```php $timeZone = new \DateTimeZone('America/Chicago'); $dateTime = new \DateTimeImmutable('2023-08-25', timezone: $timeZone); echo $dateTime->format('T') . "\n"; // CDT // Feature request: Un-abbreviated time zone format ("Q" is just an arbitrary chose) echo $dateTime->format('Q') . "\n"; // Central Daylight Time // Feature request: Add "un-abbr" offset to transitions $transition = $timeZone->getTransitions($dateTime->getTimestamp())[0]; var_export($transition); //array ( // 'ts' => 1692939600, // 'time' => '2023-08-25T05:00:00+00:00', // 'offset' => -18000, // 'isdst' => true, // 'abbr' => 'CDT', // 'un-abbr' => 'Central Daylight Time', //) ```