shigemk2 https://blog.hatena.ne.jp/shigemk2/ by shigemk2 https://www.shigemk2.com/ PHP はてなをつけたらnullable 戻り値NULLなら宣言しなくていい <?php function testReturn(): ?string { return 'elePHPant'; } var_dump(testReturn()); function testReturn(): ?string { return null; } var_dump(testReturn()); function test(?string $name) { var_dump($name); } test('elePHPant'); test(null); test(); https://www.php.net… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.shigemk2.com%2Fentry%2F2020%2F05%2F27%2F194955" title="PHP 型宣言 - by shigemk2" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2020-05-27 19:49:55 rich https://www.shigemk2.com/entry/2020/05/27/194955 1.0 100%