INTL(ICU)のIntlDateFormatterを使って和暦、曜日を表示

IntlDateFormatter.php

<?php
$date = new \DateTime();

// 平成◯◯年
$dateFormatter = \IntlDateFormatter::create(
    "ja_JP@calendar=japanese",
    \IntlDateFormatter::FULL,
    \IntlDateFormatter::FULL,
    "Asia/Tokyo",
    \IntlDateFormatter::TRADITIONAL,
    'Gyy年'
    );

 
echo $dateFormatter->format($date);

// H◯◯年
$dateFormatter = \IntlDateFormatter::create(
    "ja_JP@calendar=japanese",
    \IntlDateFormatter::FULL,
    \IntlDateFormatter::FULL,
    "Asia/Tokyo",
    \IntlDateFormatter::TRADITIONAL,
    'GGGGGyy年'
    );
 
echo $dateFormatter->format($date);

// 曜日
$dateFormatter = \IntlDateFormatter::create(
    "ja_JP@calendar=japanese",
    \IntlDateFormatter::FULL,
    \IntlDateFormatter::FULL,
    "Asia/Tokyo",
    \IntlDateFormatter::TRADITIONAL,
    'E'
    );
 
echo $dateFormatter->format($date);