"minimum-stability": "dev",
composer global require jetbrains/phpstorm-stubs
composer global require felixfbecker/language-server
cd
cd .composer
composer run-script --working-dir=vendor/felixfbecker/language-server parse-stubs
php vendor/felixfbecker/language-server/bin/php-language-server.php
[Command] + [shift] + P から次を選択
LSP: Enable Language Server
次に [Command] + [shift] + P から次を選択
LSP: Enable Language Server
LSP-intelephense を実行すると起動します。
VS CodeのPHP Intelliphenseがとても心地よくコードを補完してくれる件 - Qiita