{"id":30627,"date":"2023-11-17T05:33:16","date_gmt":"2023-07-19T14:56:36","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8php%e4%b8%ad%e5%ae%9e%e7%8e%b0%e7%a9%ba%e5%ae%89%e5%85%a8\/"},"modified":"2025-08-12T20:05:21","modified_gmt":"2025-08-12T12:05:21","slug":"%e5%9c%a8php%e4%b8%ad%e5%ae%9e%e7%8e%b0%e7%a9%ba%e5%ae%89%e5%85%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8php%e4%b8%ad%e5%ae%9e%e7%8e%b0%e7%a9%ba%e5%ae%89%e5%85%a8\/","title":{"rendered":"\u5728PHP\u4e2d\u5b9e\u73b0\u7a7a\u5b89\u5168"},"content":{"rendered":"<h1>\u524d\u63d0 (Chinese:PHP &gt;= 8.0<br \/>\nPHPStan \u7248\u672c: 1.2.0<\/p>\n<h1>\u7a7a\u5b89\u5168\u662f\u4ec0\u4e48\uff1f<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u7c21\u5358\u306b\u3044\u3046\u3068\u3001null \u304c\u539f\u56e0\u3067\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\u4ed5\u7d44\u307f\u306e\u3053\u3068\u3002<\/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\">\u30b3\u30f3\u30d1\u30a4\u30e9\u3084\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u306b\u3088\u3063\u3066 nullable \u578b\u3068non-nullable\u578b\u3092\u533a\u5225\u3057\u3001\u5fc5\u8981\u306a null \u30c1\u30a7\u30c3\u30af\u304c\u6a5f\u68b0\u7684\u306b\u5f37\u5236\u3055\u308c\u308b\u3053\u3068\u3067\u3001null \u3092\u5b89\u5168\u306b\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/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\">PHP \u3067\u306f null \u306b\u5bfe\u3057\u3066\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3092\u884c\u3046\u3068\u30a8\u30e9\u30fc\u306b\u306a\u308b\u306e\u3067 null \u5b89\u5168\u3067\u306f\u306a\u3044\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">null \u306b\u5bfe\u3059\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u30a2\u30af\u30bb\u30b9\u306f\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\u3082\u306e\u306e\u3001\u60f3\u5b9a\u5916\u306e\u6319\u52d5\u3067\u3042\u308b\u3053\u3068\u304c\u5927\u534a\u3060\u3068\u601d\u3046\u306e\u3067\u30d0\u30b0\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n\r\n<span class=\"nv\">$user<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">echo<\/span> <span class=\"nv\">$user<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">getAddress<\/span><span class=\"p\">()<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">getCountry<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ Error: Call to a member function address() on null<\/span>\r\n<span class=\"nb\">var_dump<\/span><span class=\"p\">(<\/span><span class=\"nv\">$user<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">address<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">country<\/span><span class=\"p\">);<\/span>  <span class=\"c1\">\/\/ null<\/span>\r\n<\/code><\/pre>\n<h1>\u901a\u8fc7\u4f7f\u7528PHPStan\u6765\u5b9e\u73b0null\u5b89\u5168\u3002<\/p>\n<ul class=\"post-ul\">PHP\u306e\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u3067\u3042\u308b PHPStan \u3092\u4f7f\u3046\u3068\u3001nullable \u578b\u306b\u5bfe\u3057\u3066\u76f4\u63a5\u30d7\u30ed\u30d1\u30c6\u30a3\u30a2\u30af\u30bb\u30b9\u3084\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3092\u884c\u306a\u3063\u3066\u3044\u308b\u7b87\u6240\u3092\u30a8\u30e9\u30fc\u3068\u3057\u3066\u691c\u51fa\u3059\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\uff08\u89e3\u6790\u30ec\u30d9\u30eb 8 \u4ee5\u4e0a\uff09\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">User<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">__construct<\/span><span class=\"p\">(<\/span><span class=\"kt\">private<\/span> <span class=\"kt\">?Order<\/span> <span class=\"nv\">$order<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">{<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">echoOrder<\/span><span class=\"p\">():<\/span> <span class=\"kt\">void<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">echo<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">order<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">id<\/span><span class=\"p\">;<\/span>          <span class=\"c1\">\/\/ Cannot access property $id on Order|null.<\/span>\r\n        <span class=\"k\">echo<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">order<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">createdAt<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ Cannot call method createdAt() on Order|null.<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Order<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">__construct<\/span><span class=\"p\">(<\/span><span class=\"kt\">public<\/span> <span class=\"n\">string<\/span> <span class=\"nv\">$id<\/span><span class=\"p\">,<\/span> <span class=\"kt\">public<\/span> <span class=\"nc\">DateTimeImmutable<\/span> <span class=\"nv\">$createdAt<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">{<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">createdAt<\/span><span class=\"p\">():<\/span> <span class=\"kt\">string<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">createdAt<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">format<\/span><span class=\"p\">(<\/span><span class=\"s1\">'Y-m-d'<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>phpstan \u6e38\u4e50\u573a<\/p>\n<ul class=\"post-ul\">\u3053\u308c\u3067 null \u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u304c\u6f0f\u308c\u3066\u3044\u308b\u3053\u3068\u306b\u6c17\u3065\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/ul>\n<h1>\u7a7a\uff08Null\uff09\u5904\u7406\uff08\u4eceNull\u5bf9\u8c61\u6a21\u5f0f\u5230\u5b89\u5168\u7a7a\uff08null safe\uff09\u64cd\u4f5c\u7b26\uff09<\/p>\n<ul class=\"post-ul\">null \u3092\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3059\u308b\u969b\u306bnull \u30c1\u30a7\u30c3\u30af\u304c\u91cd\u306a\u308b\u3068\u8f9b\u3044\u305f\u3081\u3001\u3053\u308c\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306e\u30d1\u30bf\u30fc\u30f3\u306b Null Object \u30d1\u30bf\u30fc\u30f3\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4f7f\u3046\u306e\u304c\u9069\u5207\u3067\u306a\u3044\u30b1\u30fc\u30b9\u3082\u3042\u308a\u307e\u3059\u3002<\/ul>\n<h2>\u60f3\u8981\u533a\u5206\u7a7a\u5bf9\u8c61\u548c\u975e\u7a7a\u5bf9\u8c61\u7684\u7c7b\u578b<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u6ce8\u6587\u3057\u305f\u5546\u54c1\u3092\u751f\u7523\u3059\u308b\u5de5\u5834\u3092\u4f8b\u306b\u6319\u3052\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5de5\u5834\uff08=Factory \u30af\u30e9\u30b9\uff09\u306e\u53d6\u5f97\u51e6\u7406\u3067\u306f\u3001\u5de5\u5834\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3092 Null Object \u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u3063\u3066 NullFactory \u3068\u3057\u3066\u8868\u73fe\u3057\u3066\u307f\u307e\u3059\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Factory<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">__construct<\/span><span class=\"p\">(<\/span><span class=\"kt\">private<\/span> <span class=\"n\">string<\/span> <span class=\"nv\">$code<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">{<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">isNull<\/span><span class=\"p\">():<\/span> <span class=\"kt\">bool<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"kc\">false<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">code<\/span><span class=\"p\">():<\/span> <span class=\"kt\">string<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">code<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">NullFactory<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Factory<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">isNull<\/span><span class=\"p\">():<\/span> <span class=\"kt\">bool<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"kc\">true<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">code<\/span><span class=\"p\">():<\/span> <span class=\"kt\">string<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"s1\">''<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">interface<\/span> <span class=\"nc\">FactoryRepository<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">find<\/span><span class=\"p\">(<\/span><span class=\"kt\">string<\/span> <span class=\"nv\">$code<\/span><span class=\"p\">):<\/span> <span class=\"kt\">Factory<\/span><span class=\"p\">;<\/span>  <span class=\"c1\">\/\/ \u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f NullFactory \u3092\u8fd4\u3059<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">SomeUseCase<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">__construct<\/span><span class=\"p\">(<\/span><span class=\"kt\">private<\/span> <span class=\"nc\">FactoryRepository<\/span> <span class=\"nv\">$factoryRepository<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">{<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">factoryCode<\/span><span class=\"p\">():<\/span> <span class=\"kt\">string<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">factoryRepository<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">find<\/span><span class=\"p\">(<\/span><span class=\"s1\">'9000'<\/span><span class=\"p\">)<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">code<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u3059\u308b\u3068\u3001\u6ce8\u6587\u30af\u30e9\u30b9\uff08=Order\uff09\u3067\u306f\u5b58\u5728\u3059\u308b\u5de5\u5834\u3092\u5272\u308a\u5f53\u3066\u305f\u3044\u306e\u3067\u578b\u3068\u3057\u3066\u306f Factory \u3067\u3059\u304c\u3001\u4e2d\u8eab\u304c Null Object \u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Order<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">private<\/span> <span class=\"kt\">Factory<\/span> <span class=\"nv\">$factory<\/span><span class=\"p\">;<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">__construct<\/span><span class=\"p\">(<\/span><span class=\"kt\">Factory<\/span> <span class=\"nv\">$factory<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">setFactoryCode<\/span><span class=\"p\">(<\/span><span class=\"nv\">$factory<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">private<\/span> <span class=\"k\">function<\/span> <span class=\"n\">setFactoryCode<\/span><span class=\"p\">(<\/span><span class=\"kt\">Factory<\/span> <span class=\"nv\">$factory<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$factory<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">isNull<\/span><span class=\"p\">())<\/span> <span class=\"p\">{<\/span>  <span class=\"c1\">\/\/ Null Object \u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af !?<\/span>\r\n            <span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"err\">\\<\/span><span class=\"nf\">InvalidArgumentException<\/span><span class=\"p\">(<\/span><span class=\"s1\">'\u5de5\u5834\u304c\u5b58\u5728\u3057\u306a\u3044'<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">factory<\/span> <span class=\"o\">=<\/span> <span class=\"nv\">$factory<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Factory \u578b\u3067\u53d7\u3051\u53d6\u3063\u3066\u3044\u308b\u306b\u3082\u95a2\u308f\u3089\u305a Null Object \u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u5206\u3001\u578b\u3068\u3057\u3066\u306e\u5f37\u5236\u529b\u304c\u5f31\u304f\u306a\u3063\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u3002<\/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\">\u4ed6\u306e\u30af\u30e9\u30b9\u3067\u3082Factory \u578b\u3092\u4f7f\u3046\u5ea6\u306b\u3001\u5b58\u5728\u3057\u306a\u3044\u5de5\u5834\u3082\u53d7\u3051\u5165\u308c\u308b\u306e\u304b\u3001\u305d\u308c\u3068\u3082\u5b58\u5728\u3059\u308b\u5de5\u5834\u3060\u3051\u53d7\u3051\u5165\u308c\u308b\u306e\u304b\u3092\u8003\u3048\u3066 Null Object \u304b\u3069\u3046\u304b\u306e\u30c1\u30a7\u30c3\u30af\u3092\u5165\u308c\u308b\u304b\u3069\u3046\u304b\u3001\u4eba\u9593\u304c\u5224\u65ad\u3057\u7d9a\u3051\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/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\">Null Object \u30d1\u30bf\u30fc\u30f3\u306f null \u304b\u3069\u3046\u304b\u3092\u5224\u5225\u305b\u305a\u306b\u5171\u901a\u3057\u305f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u5b9f\u884c\u53ef\u80fd\u306b\u3059\u308b\u3082\u306e\u3067\u3057\u305f\u304c\u3001\u3053\u3053\u3067\u306f\u305d\u308c\u304c\u88cf\u76ee\u306b\u51fa\u3066\u3044\u308b\u611f\u304c\u3042\u308a\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u3053\u306e\u72b6\u614b\u3067\u306f\u3001Null Object \u30d1\u30bf\u30fc\u30f3\u3092\u5c0e\u5165\u3059\u308b\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u5927\u304d\u3044\u305f\u3081\u3001\u5b58\u5728\u3059\u308b\u5de5\u5834\u3060\u3051\u3092 Factory \u3067\u8868\u73fe\u3057\u3001\u5b58\u5728\u3057\u306a\u3044\u5de5\u5834\u306f null \u3067\u8868\u73fe\u3057\u305f\u65b9\u304c\u3044\u3044\u3068\u8003\u3048\u307e\u3059\u3002<\/ul>\n<p>\u9664\u4e86\u4e0a\u8ff0\u4e4b\u5916\uff0c\u901a\u5e38\u88ab\u8ba4\u4e3a Null \u5bf9\u8c61\u6a21\u5f0f\u662f\u5728\u5b9a\u4e49 Null \u7c7b\u4e0d\u5b58\u5728\u65f6\u7684\u884c\u4e3a\uff0c\u4f46\u5e0c\u671b\u6839\u636e\u4f7f\u7528\u7684\u4e0a\u4e0b\u6587\u800c\u6709\u4e0d\u540c\u884c\u4e3a\u7684\u6848\u4f8b\u3002<\/p>\n<h2>\u4f7f\u7528\u7a7a\u5b89\u5168\u8fd0\u7b97\u7b26\u3002<\/p>\n<ul class=\"post-ul\">PHP8 \u672a\u6e80\u3067\u5b58\u5728\u3057\u306a\u3044\u3082\u306e\u3092 null \u3067\u8868\u73fe\u3059\u308b\u6642\u3001\u30cd\u30b9\u30c8\u306b\u306a\u308a\u8aad\u307f\u3065\u3089\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n\r\n<span class=\"nv\">$country<\/span> <span class=\"o\">=<\/span>  <span class=\"kc\">null<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$session<\/span> <span class=\"o\">!==<\/span> <span class=\"kc\">null<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nv\">$user<\/span> <span class=\"o\">=<\/span> <span class=\"nv\">$session<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">user<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$user<\/span> <span class=\"o\">!==<\/span> <span class=\"kc\">null<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nv\">$address<\/span> <span class=\"o\">=<\/span> <span class=\"nv\">$user<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">getAddress<\/span><span class=\"p\">();<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$address<\/span> <span class=\"o\">!==<\/span> <span class=\"kc\">null<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"nv\">$country<\/span> <span class=\"o\">=<\/span> <span class=\"nv\">$address<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">country<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">PHP8.0 \u3067\u306f\u305d\u308c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b null safe \u6f14\u7b97\u5b50\u304c\u5c0e\u5165\u3055\u308c\u3001\u30b9\u30c3\u30ad\u30ea\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n\r\n<span class=\"nv\">$country<\/span> <span class=\"o\">=<\/span> <span class=\"nv\">$session<\/span><span class=\"o\">?-&gt;<\/span><span class=\"n\">user<\/span><span class=\"o\">?-&gt;<\/span><span class=\"nf\">getAddress<\/span><span class=\"p\">()<\/span><span class=\"o\">?-&gt;<\/span><span class=\"n\">country<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">null safe \u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u5148\u307b\u3069 Null Object \u30d1\u30bf\u30fc\u30f3\u3067\u5b9f\u88c5\u3057\u305f\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u63db\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n\r\n<span class=\"kd\">interface<\/span> <span class=\"nc\">FactoryRepository<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">find<\/span><span class=\"p\">(<\/span><span class=\"kt\">string<\/span> <span class=\"nv\">$code<\/span><span class=\"p\">):<\/span> <span class=\"kt\">?Factory<\/span><span class=\"p\">;<\/span>  <span class=\"c1\">\/\/ \u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f null \u3092\u8fd4\u3059<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">SomeUseCase<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">__construct<\/span><span class=\"p\">(<\/span><span class=\"kt\">private<\/span> <span class=\"nc\">FactoryRepository<\/span> <span class=\"nv\">$factoryRepository<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">{<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">factoryCode<\/span><span class=\"p\">():<\/span> <span class=\"kt\">string<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">factoryRepository<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">find<\/span><span class=\"p\">(<\/span><span class=\"s1\">'9000'<\/span><span class=\"p\">)<\/span><span class=\"o\">?-&gt;<\/span><span class=\"nf\">code<\/span><span class=\"p\">()<\/span> <span class=\"o\">??<\/span> <span class=\"s1\">''<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u3053\u308c\u3067 null Object \u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u308f\u306a\u304f\u3066\u3082\u3001null \u3092\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3059\u308b\u8f9b\u3055\u304c\u3060\u3044\u3076\u8efd\u6e1b\u3055\u308c\u307e\u3059\u306d\u3002<\/ul>\n<h1>\u9519\u8bef\u5730\u5c06\u975e\u7a7a\u7c7b\u578b\u5904\u7406\u4e3a\u7a7a\u503c<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">PHPStan \u306f nullable \u578b\u306b\u304a\u3044\u3066 null \u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3092\u5f37\u5236\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001non-nullable \u578b\u3092\u8aa4\u3063\u3066 null \u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3057\u3066\u3044\u308b\u6240\u3092\u9664\u5916\u3059\u308b\u3088\u3046\u5f37\u5236\u3059\u308b\u3053\u3068\u304c\u307b\u307c\u307b\u307c\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/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\">\u305f\u3060\u3001non-nullable \u578b\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u5bfe\u3057\u3066 null\u5408\u4f53\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u6240\u3067\u306f\u30a8\u30e9\u30fc\u3092\u8d77\u3053\u305b\u3066\u304a\u3089\u305a\u3001\u3053\u308c\u306f PHPStan \u306e\u30d0\u30b0\u3060\u3068\u601d\u308f\u308c\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u3053\u308c\u304c\u898b\u904e\u3054\u3055\u308c\u3066\u3082\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u304c\u3001null \u3092\u8003\u616e\u3057\u3066\u3044\u308b\u90e8\u5206\u304c\u30c7\u30c3\u30c9\u30b3\u30fc\u30c9\u306b\u306a\u308b\u3053\u3068\u3067\u53ef\u8aad\u6027\u304c\u843d\u3061\u308b\u306e\u3067\u76f4\u308b\u3068\u5b09\u3057\u3044\u3067\u3059\u306d\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">User<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">__construct<\/span><span class=\"p\">(<\/span><span class=\"kt\">private<\/span> <span class=\"nc\">Order<\/span> <span class=\"nv\">$order2<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">{<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">echoOrder<\/span><span class=\"p\">():<\/span> <span class=\"kt\">void<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">echo<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">order2<\/span><span class=\"o\">?-&gt;<\/span><span class=\"n\">id<\/span><span class=\"p\">;<\/span>    <span class=\"c1\">\/\/ PHPStan Error: Using nullsafe property access on non-nullable type Order<\/span>\r\n        <span class=\"k\">echo<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">order2<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">createdAt<\/span><span class=\"p\">()<\/span><span class=\"o\">?-&gt;<\/span><span class=\"nf\">format<\/span><span class=\"p\">(<\/span><span class=\"s1\">'Y-m-d'<\/span><span class=\"p\">);<\/span>    <span class=\"c1\">\/\/ PHPStan Error: Using nullsafe method call on non-nullable type DateTimeImmutable<\/span>\r\n        <span class=\"k\">echo<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">order2<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">id<\/span> <span class=\"o\">??<\/span> <span class=\"s1\">''<\/span><span class=\"p\">;<\/span>  <span class=\"c1\">\/\/ string \u578b\u306b\u5bfe\u3057\u3066 null \u3092\u8003\u616e\u3057\u305f\u66f8\u304d\u65b9\u306b\u306a\u3063\u3066\u3044\u308b\u304c\u3001PHPStan \u30a8\u30e9\u30fc\u306b\u306f\u306a\u3089\u306a\u3044<\/span>\r\n        <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">order2<\/span><span class=\"o\">-&gt;<\/span><span class=\"nf\">createdAt<\/span><span class=\"p\">()<\/span> <span class=\"o\">??<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">DateTimeImmutable<\/span><span class=\"p\">();<\/span>    <span class=\"c1\">\/\/ PHPStan Error: Expression on left side of ?? is not nullable<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Order<\/span>\r\n<span class=\"p\">{<\/span>\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">__construct<\/span><span class=\"p\">(<\/span><span class=\"kt\">public<\/span> <span class=\"n\">string<\/span> <span class=\"nv\">$id<\/span><span class=\"p\">,<\/span> <span class=\"kt\">public<\/span> <span class=\"nc\">DateTimeImmutable<\/span> <span class=\"nv\">$createdAt<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">{<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">public<\/span> <span class=\"k\">function<\/span> <span class=\"n\">createdAt<\/span><span class=\"p\">():<\/span> <span class=\"kt\">DateTimeImmutable<\/span>\r\n    <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">createdAt<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>PHPStan \u6e38\u4e50\u573a<\/p>\n<h1>\u603b\u7ed3<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">PHPStan \u3067 null\u5b89\u5168\u306b\u3057\u3064\u3064\u3001null safe \u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u3053\u3068\u3067 null\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3092\u3084\u308a\u6613\u304f\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">PHP \u3082\u5468\u8fba\u30c4\u30fc\u30eb\u3082\u65e5\u3005\u9032\u5316\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u65b0\u6a5f\u80fd\u3092\u4e0a\u624b\u304f\u53d6\u308a\u8fbc\u307f\u306a\u304c\u3089\u52b9\u7387\u7684\u306b\u958b\u767a\u3057\u3066\u3044\u304d\u305f\u3044\u3067\u3059\u306d\u3002<\/ul>\n<h1>\u8bf7\u9605\u8bfb\u4ee5\u4e0b\u5185\u5bb9\u3002PHP\u5b98\u65b9\u6587\u6863\uff1anull \u5b89\u5168\u64cd\u4f5c\u7b26<br \/>\nRFC\uff1anull \u5b89\u5168\u64cd\u4f5c\u7b26<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u63d0 (Chinese:PHP &gt;= 8.0 PHPStan \u7248\u672c: 1.2.0 \u7a7a\u5b89\u5168\u662f\u4ec0\u4e48\uff1f \u7c21\u5358\u306b [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30627","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5728PHP\u4e2d\u5b9e\u73b0\u7a7a\u5b89\u5168 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u5728PHP\u4e2d\u5b9e\u73b0\u7a7a\u5b89\u5168\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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