{"id":30534,"date":"2023-03-29T00:33:34","date_gmt":"2023-08-15T08:42:29","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e-php-nullsafe-%e6%93%8d%e4%bd%9c%e7%ac%a6%ef%bc%88-%ef%bc%89%e7%9a%84%e9%97%ae%e9%a2%98\/"},"modified":"2025-08-12T19:38:06","modified_gmt":"2025-08-12T11:38:06","slug":"%e5%85%b3%e4%ba%8e-php-nullsafe-%e6%93%8d%e4%bd%9c%e7%ac%a6%ef%bc%88-%ef%bc%89%e7%9a%84%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e-php-nullsafe-%e6%93%8d%e4%bd%9c%e7%ac%a6%ef%bc%88-%ef%bc%89%e7%9a%84%e9%97%ae%e9%a2%98\/","title":{"rendered":"\u5173\u4e8e PHP nullsafe \u64cd\u4f5c\u7b26\uff08?->\uff09\u7684\u95ee\u9898"},"content":{"rendered":"<h1>\u603b\u7ed3\u3002<\/h1>\n<ul class=\"post-ul\">\u5b9f\u52d9\u3067nullsafe\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u4e8b\u304c\u3042\u3063\u305f\u306e\u3067\u3069\u3046\u3044\u3046\u3082\u306e\u304b\u307e\u3068\u3081\u3066\u304a\u304f\u3002<\/ul>\n<h1>\u7a7a\u5b89\u5168\u8fd0\u7b97\u7b26<\/h1>\n<p>nullsafe\u6f14\u7b97\u5b50\u306f\u4e0b\u8a18\u3067\u3042\u308b\u3002<br \/>\n?-&gt;<\/p>\n<p>\u4e0b\u8a18\u306e\u69d8\u306a\u30b3\u30fc\u30c9\u304c\u3042\u3063\u305f\u3068\u3059\u308b\u3002<br \/>\nif (is_null($repository)) {<br \/>\n$result = null;<br \/>\n} else {<br \/>\n$user = $repository-&gt;getUser(5);<br \/>\nif (is_null($user)) {<br \/>\n$result = null;<br \/>\n} else {<br \/>\n$result = $user-&gt;name;<br \/>\n}<br \/>\n}<\/p>\n<p>\u4e0b\u8a18\u306e\u69d8\u306a\u51e6\u7406\u306b\u306a\u3063\u3066\u3044\u308b\u3002<\/p>\n<p>$repository\u304cnull\u306e\u3068\u304dnull\u3092$result\u306b\u683c\u7d0d\u3059\u308b\u3002<\/p>\n<p>$repository\u304cnull\u3067\u306f\u306a\u3044\u304b\u3064\u3001$repository-&gt;getUser(5)\u304cnull\u306e\u3068\u304dnull\u3092$result\u306b\u683c\u7d0d\u3059\u308b\u3002<\/p>\n<p>$repository\u304cnull\u3067\u306f\u306a\u3044\u304b\u3064\u3001$repository-&gt;getUser(5)\u304cnull\u3058\u3083\u306a\u3044\u3068\u304d$user-&gt;name\u3092$result\u306b\u683c\u7d0d\u3059\u308b\u3002<\/p>\n<p>PHP8\u304b\u3089\u306enullsafe\u6f14\u7b97\u5b50\u3092\u7528\u3044\u308b\u3068\u4e0b\u8a18\u306e\u69d8\u306b\u8a18\u8f09\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\u3089\u3057\u3044\u3002\uff08nullsafe\u6f14\u7b97\u5b50\u306e\u5de6\u5074\u306e\u5024\u304cnull\u306e\u6642\u306b\u305d\u308c\u4ee5\u964d\u51e6\u7406\u3092\u5b9f\u884c\u305b\u305anull\u3092\u8fd4\u3059\u3002\uff09<br \/>\n$result = $repository?-&gt;getUser(5)?-&gt;name;<\/p>\n<p>nullsafe\u6f14\u7b97\u5b50\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u8907\u96d1\u306a\u8a18\u8f09\u30921\u884c\u3067\u8a18\u8f09\u3059\u308b\u4e8b\u304c\u3067\u304d\u308b\u3002<\/p>\n<h1>\u53c2\u8003\u8d44\u6599<\/h1>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">https:\/\/qiita.com\/rana_kualu\/items\/c967d58582ef75e73d7d<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">https:\/\/qiita.com\/atsu_kg\/items\/9122a5a1091557b041b3<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">https:\/\/www.php.net\/manual\/ja\/language.oop5.basic.php#language.oop5.basic.nullsafe<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u603b\u7ed3\u3002 \u5b9f\u52d9\u3067nullsafe\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u4e8b\u304c\u3042\u3063\u305f\u306e\u3067\u3069\u3046\u3044\u3046\u3082\u306e\u304b\u307e\u3068\u3081\u3066\u304a\u304f\u3002 \u7a7a\u5b89\u5168\u8fd0\u7b97\u7b26 nulls [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30534","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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