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■PHP8
PHP: PHP 8.0.0 Release Announcement https://www.php.net/releases/8.0/ja.php 【PHP8.0】PHP8.0の新機能 - Qiita https://qiita.com/rana_kualu/items/fe7998fbe773544d5d25 【PHP8.1】PHP8.1の新機能 - Qiita https://qiita.com/rana_kualu/items/a6601b49e0591eb42200