{"id":30405,"date":"2023-02-09T21:01:56","date_gmt":"2023-03-05T01:34:06","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90php7-4%e3%80%91php%e7%9a%84%e6%96%b0%e8%bf%90%e7%ae%97%e7%ac%a6%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f\/"},"modified":"2025-08-12T19:01:16","modified_gmt":"2025-08-12T11:01:16","slug":"%e3%80%90php7-4%e3%80%91php%e7%9a%84%e6%96%b0%e8%bf%90%e7%ae%97%e7%ac%a6%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90php7-4%e3%80%91php%e7%9a%84%e6%96%b0%e8%bf%90%e7%ae%97%e7%ac%a6%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f\/","title":{"rendered":"\u3010PHP7.4\u3011PHP\u7684\u65b0\u8fd0\u7b97\u7b26??=\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p>\u57282019\u5e7401\u670822\u65e5\uff08\u65e5\u672c\u6807\u51c6\u65f6\u95f4\uff09\u53d1\u751f\u4e86\u4e00\u4e2a\u795e\u79d8\u7684\u5408\u5e76\uff0c\u540d\u4e3aImplement ??=\u64cd\u4f5c\u7b26\u3002<\/p>\n<h1>RFC (Request for Comments)\u662f\u4e00\u79cd\u7528\u4e8e\u5236\u5b9a\u4e92\u8054\u7f51\u6807\u51c6\u7684\u6587\u4ef6\u3002<\/h1>\n<p>RFC\u5df2\u4ee537\u7968\u8d5e\u540c\u30014\u7968\u53cd\u5bf9\u7684\u538b\u5012\u6027\u591a\u6570\u901a\u8fc7\u4e86\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u6295\u7968\u5f00\u59cb\u65e5\u671f\u4e3a2016\u5e7403\u670824\u65e5\uff0c\u7ed3\u675f\u65e5\u671f\u4e3a2016\u5e7404\u670802\u65e5\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u88ab\u5ffd\u89c6\u4e86\u8fd13\u5e74\u3002<\/p>\n<h1>\u201c??\u201d \u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/h1>\n<p>RFC\u4e2d\u79f0\u4e4b\u4e3a\u201cNull Coalescing Assignment Operator\u201d\u3002<br \/>\n\u4f3c\u4e4e\u6ca1\u6709\u5408\u9002\u7684\u65e5\u8bed\u8bcd\u6c47\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u63a8\u5bfc\u81ea\u201cNULL\u5408\u4f53\u6f14\u7b97\u5b50\u201d(Null Coalescing Operator)\u7684\u65b9\u5f0f\uff0c\u79f0\u4e4b\u4e3a\u201cNULL\u5408\u4f53\u4ee3\u5165\u6f14\u7b97\u5b50\u201d\u5417\uff1f<\/p>\n<p>\u8fd9\u4e2a\u8fd0\u7b97\u7b26\u7c7b\u4f3c\u4e8e\u5c06null\u5408\u5e76\u8fd0\u7b97\u7b26\u548c\u8d4b\u503c\u8fd0\u7b97\u7b26\u7ed3\u5408\u5728\u4e00\u8d77\u7684\u64cd\u4f5c\u7b26\u3002<\/p>\n<h1>\u5982\u4f55\u4f7f\u7528<\/h1>\n<pre class=\"post-pre\"><code>    <span class=\"c1\">\/\/ NULL\u5408\u4f53\u4ee3\u5165\u6f14\u7b97\u5b50<\/span>\r\n    <span class=\"nv\">$id<\/span> <span class=\"o\">??=<\/span> <span class=\"nf\">getId<\/span><span class=\"p\">();<\/span>\r\n\r\n    <span class=\"c1\">\/\/ \u3053\u308c\u3068\u540c\u3058<\/span>\r\n    <span class=\"nv\">$id<\/span> <span class=\"o\">=<\/span> <span class=\"nv\">$id<\/span> <span class=\"o\">??<\/span> <span class=\"nf\">getId<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"nv\">$id<\/span> <span class=\"o\">=<\/span> <span class=\"o\">@<\/span><span class=\"nv\">$id<\/span> <span class=\"o\">?:<\/span> <span class=\"nf\">getId<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"nv\">$id<\/span> <span class=\"o\">=<\/span> <span class=\"k\">isset<\/span><span class=\"p\">(<\/span><span class=\"nv\">$id<\/span><span class=\"p\">)<\/span> <span class=\"o\">?<\/span> <span class=\"nv\">$id<\/span> <span class=\"o\">:<\/span> <span class=\"nf\">getId<\/span><span class=\"p\">();<\/span>\r\n<\/code><\/pre>\n<p>\u662f\u7684\uff0cNULL\u5408\u4f53\u4ee3\u5165\u6f14\u7b97\u5b50\u662f\u7701\u7565\u4e86\u4e09\u4e2a\u8fd0\u7b97\u7b26\uff08\u4e09\u9805\u6f14\u7b97\u5b50\u3001\u30a8\u30eb\u30d3\u30b9\u6f14\u7b97\u5b50\u548cNULL\u5408\u4f53\u6f14\u7b97\u5b50\uff09\u7684\u7b80\u5199\u5f62\u5f0f\u3002<\/p>\n<p>\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\u53ef\u80fd\u65e0\u6cd5\u611f\u53d7\u5230\u592a\u591a\u597d\u5904\uff0c\u4f46\u5bf9\u4e8e\u5de6\u8fb9\u503e\u5411\u4e8e\u8f83\u957f\u7684\u6846\u67b6\u6765\u8bf4\uff0c\u4f18\u70b9\u5c06\u66f4\u591a\u3002<br \/>\n\u5728RFC\u7684\u793a\u4f8b\u4e2d\u6709\u4ee5\u4e0b\u7684\u4f8b\u5b50\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"c1\">\/\/ \u3053\u308c\u307e\u3067<\/span>\r\n    <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">request<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">data<\/span><span class=\"p\">[<\/span><span class=\"s1\">'comments'<\/span><span class=\"p\">][<\/span><span class=\"s1\">'user_id'<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">request<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">data<\/span><span class=\"p\">[<\/span><span class=\"s1\">'comments'<\/span><span class=\"p\">][<\/span><span class=\"s1\">'user_id'<\/span><span class=\"p\">]<\/span> <span class=\"o\">??<\/span> <span class=\"s1\">'value'<\/span><span class=\"p\">;<\/span>\r\n\r\n    <span class=\"c1\">\/\/ \u4eca\u5f8c<\/span>\r\n    <span class=\"nv\">$this<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">request<\/span><span class=\"o\">-&gt;<\/span><span class=\"n\">data<\/span><span class=\"p\">[<\/span><span class=\"s1\">'comments'<\/span><span class=\"p\">][<\/span><span class=\"s1\">'user_id'<\/span><span class=\"p\">]<\/span> <span class=\"o\">??=<\/span> <span class=\"s1\">'value'<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u786e\u5b9e\u5f88\u65b9\u4fbf\u3002<\/p>\n<p>\u55ef\uff1f<\/p>\n<h1>\u5f15\u5bfc<\/h1>\n<p>\u5c06\u5728PHP 7.4\u4e2d\u5f15\u5165\u3002<\/p>\n<h1>\u4ed6\u5728\u8bed\u8a00\u4e0a\u7684\u5b9e\u65bd<\/h1>\n<p>\u636e\u62a5\u9053\uff0cC# 8.0\u5c06\u4e8e2019\u5e74\u53d1\u5e03\u3002<\/p>\n<p>\u5728Ruby\u4e2d\uff0c\u5177\u6709\u81ea\u8d4b\u503c\u8fd0\u7b97\u7b26\u201c||=\u201d\u7684\u4e60\u60ef\u7528\u6cd5\u4e0e\u201c||\u201d\u6709\u7740\u76f8\u4f3c\u7684\u884c\u4e3a\uff08\u5982\u679c\u5de6\u4fa7\u4e3anil\u6216false\uff0c\u5219\u8d4b\u503c\u53f3\u4fa7\u7684\u503c\u3002\u7531\u4e8e\u5305\u542b\u4e86false\uff0c\u56e0\u6b64\u4e25\u683c\u6765\u8bf4\u662f\u4e0d\u540c\u7684\u884c\u4e3a\uff09\u3002<\/p>\n<p>\u5728\u5176\u4ed6\u8bed\u8a00\u4e2d\u5b8c\u5168\u627e\u4e0d\u5230\u3002<\/p>\n<h1>\u5370\u8c61<\/h1>\n<p>\u6211\u8ba4\u4e3a\u8fd9\u662f\u4e00\u79cd\u6e90\u81eaWeb\u7684PHP\u64cd\u4f5c\u7b26\uff0c\u7528\u4e8e\u8868\u793a\u4e0d\u786e\u5b9a\u662f\u5426\u4f1a\u6709\u6570\u636e\u8f93\u5165\u3002<br \/>\n\u5982\u679c\u5728\u5176\u4ed6\u8bed\u8a00\u4e2d\uff0c\u53ef\u80fd\u4f1a\u8981\u6c42\u66f4\u660e\u786e\u5730\u5b9a\u4e49\u8f93\u5165\uff0c\u4f46\u5728Web API\u7b49\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4e0d\u80fd\u8fd9\u6837\u8bf4\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u5bf9\u4e8e\u662f\u5426\u60f3\u8981\u4f7f\u7528\u5b83\u81ea\u5df1\u6765\u8bf4\uff0c\u6709\u70b9\u5fae\u5999\u3002<br \/>\n\u5df2\u7ecf\u6709\u5f88\u591a\u7f29\u5199\u8bed\u6cd5\u4e86\uff0c\u5982\u679c\u518d\u589e\u52a0\u7684\u8bdd\u53ef\u80fd\u4f1a\u66f4\u52a0\u6df7\u4e71\u3002<br \/>\n\u55ef\uff0c\u50cf?:\u548c??\u4e4b\u7c7b\u7684\u6211\u4e5f\u4e0d\u77e5\u4e0d\u89c9\u5730\u7ecf\u5e38\u4f7f\u7528\uff0c\u6240\u4ee5\u8bf4\uff0c\u5c06\u6765\u53ef\u80fd\u4e5f\u4f1a\u53d8\u6210\u6b63\u5e38\u4f7f\u7528??=\u5427\u3002<br \/>\n\u4e0d\u8fc7&lt;=&gt;\u6211\u6ca1\u6709\u4f7f\u7528\u7684\u673a\u4f1a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u57282019\u5e7401\u670822\u65e5\uff08\u65e5\u672c\u6807\u51c6\u65f6\u95f4\uff09\u53d1\u751f\u4e86\u4e00\u4e2a\u795e\u79d8\u7684\u5408\u5e76\uff0c\u540d\u4e3aImplement ??=\u64cd\u4f5c\u7b26\u3002 RFC  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