{"id":30378,"date":"2023-06-27T22:24:04","date_gmt":"2023-01-10T11:12:20","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8php%e7%9a%84if%e8%af%ad%e5%8f%a5%e3%80%82\/"},"modified":"2025-08-12T18:53:05","modified_gmt":"2025-08-12T10:53:05","slug":"%e4%bd%bf%e7%94%a8php%e7%9a%84if%e8%af%ad%e5%8f%a5%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8php%e7%9a%84if%e8%af%ad%e5%8f%a5%e3%80%82\/","title":{"rendered":"\u4f7f\u7528PHP\u7684if\u8bed\u53e5"},"content":{"rendered":"<p>\u5728PHP\u4e2d\u6709if\u8bed\u53e5\u3002\u7136\u800c\uff0c\u4f9d\u8d56\u522b\u4eba\u7f16\u5199\u7684\u4ee3\u7801\u662f\u611a\u8822\u7684\u3002\u6211\u4eec\u5e94\u8be5\u81ea\u5df1\u53bb\u5b9e\u73b0\u3002<\/p>\n<p>\u6362\u53e5\u8bdd\u8bf4\uff0c\u7406\u60f3\u7684\u60c5\u51b5\u662f\u8fd9\u6837\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">echo<\/span> <span class=\"nv\">$if<\/span><span class=\"p\">(<\/span><span class=\"nv\">$true<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'foo'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'bar'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"c1\">\/\/ =&gt; 'foo'<\/span>\r\n\r\n<span class=\"k\">echo<\/span> <span class=\"nv\">$if<\/span><span class=\"p\">(<\/span><span class=\"nv\">$false<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'foo'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'bar'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"c1\">\/\/ =&gt; 'bar'<\/span>\r\n<\/code><\/pre>\n<p>\u51fd\u6570\u5177\u6709\u80fd\u529b\u3002\u5229\u7528\u8fd9\u79cd\u80fd\u529b\uff0c\u4f60\u5e94\u8be5\u80fd\u591f\u5b9e\u73b0\u81ea\u5df1\u4f7f\u7528\u7684$true\u548c$false\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">$true<\/span>  <span class=\"o\">=<\/span> <span class=\"k\">function<\/span> <span class=\"p\">(...)<\/span> <span class=\"p\">{<\/span> <span class=\"k\">return<\/span> <span class=\"mf\">...<\/span><span class=\"p\">;<\/span> <span class=\"p\">};<\/span>\r\n<span class=\"nv\">$false<\/span> <span class=\"o\">=<\/span> <span class=\"k\">function<\/span> <span class=\"p\">(...)<\/span> <span class=\"p\">{<\/span> <span class=\"k\">return<\/span> <span class=\"mf\">...<\/span><span class=\"p\">;<\/span> <span class=\"p\">};<\/span>\r\n\r\n<span class=\"nv\">$if<\/span> <span class=\"o\">=<\/span> <span class=\"k\">function<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$cond<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$then<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$else<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"mf\">...<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c $cond \u4e3a\u64cd\u4f5c\u6570\uff0c\u5219 $if \u63a5\u53d7 $then \u548c $else \u4f5c\u4e3a\u64cd\u4f5c\u6570\u3002<\/p>\n<p>\u4ece\u5b9e\u7528\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u5982\u679c\u6211\u4eec\u8fdb\u4e00\u6b65\u5b9a\u4e49\u4ee5\u4e0b\u51fd\u6570\uff0c\u90a3\u5c06\u4f1a\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">$eq<\/span> <span class=\"o\">=<\/span> <span class=\"k\">function<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$a<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$b<\/span><span class=\"p\">)<\/span> <span class=\"k\">use<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$true<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$false<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$a<\/span> <span class=\"o\">===<\/span> <span class=\"nv\">$b<\/span><span class=\"p\">)<\/span> <span class=\"o\">?<\/span> <span class=\"nv\">$true<\/span> <span class=\"o\">:<\/span> <span class=\"nv\">$false<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"k\">echo<\/span> <span class=\"nv\">$if<\/span><span class=\"p\">(<\/span><span class=\"nv\">$eq<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span><span class=\"p\">,<\/span> <span class=\"mi\">20<\/span><span class=\"p\">),<\/span> <span class=\"s1\">'equals!'<\/span><span class=\"p\">,<\/span> <span class=\"s1\">'not equals'<\/span><span class=\"p\">);<\/span>\r\n<\/code><\/pre>\n<p>\u800c\u4e14\u8fd8\u53ef\u4ee5\u8f7b\u677e\u5730\u5b9e\u73b0\u4ee5\u4e0b\u8fd9\u6837\u7684\u903b\u8f91\u8fd0\u7b97\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">$not<\/span> <span class=\"o\">=<\/span> <span class=\"k\">function<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$v<\/span><span class=\"p\">)<\/span> <span class=\"k\">use<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$true<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$false<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nv\">$v<\/span><span class=\"p\">(<\/span><span class=\"nv\">$false<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$true<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"nv\">$and<\/span> <span class=\"o\">=<\/span> <span class=\"k\">function<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$x<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$y<\/span><span class=\"p\">)<\/span> <span class=\"k\">use<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$false<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nv\">$x<\/span><span class=\"p\">(<\/span><span class=\"nv\">$y<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$false<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"nv\">$or<\/span> <span class=\"o\">=<\/span> <span class=\"k\">function<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$x<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$y<\/span><span class=\"p\">)<\/span> <span class=\"k\">use<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$true<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nv\">$x<\/span><span class=\"p\">(<\/span><span class=\"nv\">$true<\/span><span class=\"p\">,<\/span> <span class=\"nv\">$y<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"nb\">var_dump<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"nv\">$if<\/span><span class=\"p\">(<\/span><span class=\"nv\">$and<\/span><span class=\"p\">(<\/span><span class=\"nv\">$eq<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span><span class=\"p\">,<\/span> <span class=\"mi\">10<\/span><span class=\"p\">),<\/span>\r\n             <span class=\"nv\">$eq<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span><span class=\"p\">,<\/span> <span class=\"mi\">20<\/span><span class=\"p\">)),<\/span>\r\n        <span class=\"s1\">'TruE'<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"s1\">'FalsE'<\/span><span class=\"p\">));<\/span>\r\n<\/code><\/pre>\n<p>\u4ec0\u4e48\uff1f\u8fd9\u6837\u7684\u8bdd\u5c31\u6ca1\u6cd5\u76f8\u4e92\u64cd\u4f5c\u4e86\uff0c\u5f88\u4e0d\u65b9\u4fbf\uff1f\u6ca1\u529e\u6cd5\uff0c\u96be\u9053\u4e0d\u53ef\u4ee5\u63d0\u4f9b\u4e00\u4e2a\u51fd\u6570\u5c06\u6211\u7684\u81ea\u5b9a\u4e49\u5e03\u5c14\u7c7b\u578b\u8f6c\u6362\u4e3aPHP\u7684bool\u7c7b\u578b\u5417\uff1f<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">$PHPBool<\/span> <span class=\"o\">=<\/span> <span class=\"k\">function<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$bool<\/span><span class=\"p\">)<\/span> <span class=\"k\">use<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$if<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"nv\">$if<\/span><span class=\"p\">(<\/span><span class=\"nv\">$bool<\/span><span class=\"p\">,<\/span> <span class=\"kc\">true<\/span><span class=\"p\">,<\/span> <span class=\"kc\">false<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n\r\n<span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$PHPBool<\/span><span class=\"p\">(<\/span><span class=\"nv\">$eq<\/span><span class=\"p\">(<\/span><span class=\"mi\">10<\/span><span class=\"p\">,<\/span> <span class=\"mi\">99<\/span><span class=\"p\">)))<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nb\">var_dump<\/span><span class=\"p\">(<\/span><span class=\"s2\">\"foo\"<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span> <span class=\"k\">else<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nb\">var_dump<\/span><span class=\"p\">(<\/span><span class=\"s2\">\"bar\"<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u540e\u8bb0<\/h3>\n<p>\u5185\u5bb9\u548c\u4ee5\u4e0b\u7684\u6587\u7ae0\u51e0\u4e4e\u4e00\u6837\u3002\u672c\u6765\u4ee5\u4e3a\u80fd\u907f\u514d\u91cd\u590d\uff0c\u4f46\u7531\u4e8e\u653e\u7f6e\u4e86\u4e00\u5468\u672a\u5199\u5b8c\u800c\u88ab\u522b\u4eba\u62a2\u5148\u4e86\uff0c\u771f\u662f\u6709\u70b9\u4e0d\u723d\u3002<\/p>\n<p>Re: if\u6587\u3082\u4e09\u9805\u6f14\u7b97\u5b50\u3082\u66f8\u304b\u306a\u3044\u3067\u6761\u4ef6\u5206\u5c90\u3092\u30b9\u30c3\u30ad\u30ea\u3055\u305b\u308b &#8211; Qiita by @irxground<\/p>\n<p>PHP &#8211; if\u6587\u3082\u4e09\u9805\u6f14\u7b97\u5b50\u3082\u66f8\u304b\u306a\u3044\u3067\u6761\u4ef6\u5206\u5c90\u3092\u30b9\u30c3\u30ad\u30ea\u3055\u305b\u308b &#8211; Qiita by @t_ishida<\/p>\n<p>\u7a0d\u5fae\u8be6\u7ec6\u5730\u5199\u4e00\u4e0b\uff0c\u8fd9\u662f\u76f8\u5f53\u4e8e\u65e0\u7c7b\u578b\u03bb\u6f14\u7b97\u7684\u57fa\u7840\u3002\u5173\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u4e4b\u524d\u5df2\u7ecf\u5199\u8fc7\u4e86\u3002\u4e24\u7bc7\u6587\u7ae0\u90fd\u5f88\u77ed\uff0c\u5982\u679c\u60a8\u611f\u5174\u8da3\u7684\u8bdd\uff0c\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">DT\u6226\u8a18 &#8211; Python\u3067\u30e9\u30e0\u30c0\u8a08\u7b97<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">DT\u6226\u8a18 &#8211; \u3010DT\u9591\u8a71\u3011\u7ae5\u8c9e\u30d7\u30ed\u30b0\u30e9\u30de\u304c\u51fd\u6570\u578b\u8a00\u8a9e(\u3068\u30e9\u30e0\u30c0\u8a08\u7b97)\u3092\u7406\u89e3\u3057\u3066\u307f\u308b\u3010\u521d\u5fc3\u8005\u5411\u3051\u89e3\u8aac\u3011<\/ul>\n<p>\u5982\u679c\u5728\u4ee3\u4ee3\u6728\u9644\u8fd1\u6216\u5176\u4ed6\u5730\u65b9\u770b\u89c1\u6709\u4eba\u8bf4\uff1a\u201c\u5582\uff0c\u8fd9\u662f\u600e\u4e48\u56de\u4e8b\u554a\uff1f\u201d\u6211\u4eec\u5e94\u8be5\u53bb\u8ffd\u95ee\u4ed6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728PHP\u4e2d\u6709if\u8bed\u53e5\u3002\u7136\u800c\uff0c\u4f9d\u8d56\u522b\u4eba\u7f16\u5199\u7684\u4ee3\u7801\u662f\u611a\u8822\u7684\u3002\u6211\u4eec\u5e94\u8be5\u81ea\u5df1\u53bb\u5b9e\u73b0\u3002 \u6362\u53e5\u8bdd\u8bf4\uff0c\u7406\u60f3\u7684\u60c5\u51b5\u662f\u8fd9\u6837\u7684\u3002  [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30378","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>\u4f7f\u7528PHP\u7684if\u8bed\u53e5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u4f7f\u7528PHP\u7684if\u8bed\u53e5\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\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528php\u7684if\u8bed\u53e5\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528PHP\u7684if\u8bed\u53e5\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8e\u4f7f\u7528PHP\u7684if\u8bed\u53e5\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528php\u7684if\u8bed\u53e5\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-01-10T11:12:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-12T10:53:05+00:00\" \/>\n<meta name=\"author\" content=\"\u97f5, \u79d1\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u97f5, \u79d1\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8php%e7%9a%84if%e8%af%ad%e5%8f%a5%e3%80%82\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8php%e7%9a%84if%e8%af%ad%e5%8f%a5%e3%80%82\/\",\"name\":\"\u4f7f\u7528PHP\u7684if\u8bed\u53e5 - Blog - Silicon 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