{"id":217863,"date":"2023-12-23T01:31:25","date_gmt":"2023-12-22T17:31:25","guid":{"rendered":"https:\/\/www.idc.net\/help\/217863\/"},"modified":"2023-12-23T01:31:25","modified_gmt":"2023-12-22T17:31:25","slug":"php%e5%87%bd%e6%95%b0%ef%bc%9aacos","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/217863\/","title":{"rendered":"PHP\u51fd\u6570\uff1aacos"},"content":{"rendered":"<h1 id=\"php%e5%87%bd%e6%95%b0%ef%bc%9aacos-UWNeqVTxJc\">PHP\u51fd\u6570\uff1aacos<\/h1>\n<p>\u5728PHP\u7f16\u7a0b\u4e2d\uff0cacos()\u51fd\u6570\u662f\u4e00\u4e2a\u7528\u4e8e\u8ba1\u7b97\u4e00\u4e2a\u6570\u7684\u53cd\u4f59\u5f26\u503c\u7684\u6570\u5b66\u51fd\u6570\u3002\u5b83\u8fd4\u56de\u4e00\u4e2a\u4ecb\u4e8e0\u548c\u03c0\u4e4b\u95f4\u7684\u89d2\u5ea6\uff0c\u8868\u793a\u7ed9\u5b9a\u6570\u7684\u53cd\u4f59\u5f26\u503c\u3002<\/p>\n<h2 id=\"%e8%af%ad%e6%b3%95-UWNeqVTxJc\">\u8bed\u6cd5<\/h2>\n<p>acos(x)<\/p>\n<h2 id=\"%e5%8f%82%e6%95%b0-UWNeqVTxJc\">\u53c2\u6570<\/h2>\n<p>x\uff1a\u5fc5\u9700\uff0c\u4e00\u4e2a\u4ecb\u4e8e-1\u548c1\u4e4b\u95f4\u7684\u6570\u503c\uff0c\u8868\u793a\u4f59\u5f26\u503c\u3002<\/p>\n<h2 id=\"%e8%bf%94%e5%9b%9e%e5%80%bc-UWNeqVTxJc\">\u8fd4\u56de\u503c<\/h2>\n<p>acos()\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u4ecb\u4e8e0\u548c\u03c0\u4e4b\u95f4\u7684\u89d2\u5ea6\uff0c\u8868\u793a\u7ed9\u5b9a\u6570\u7684\u53cd\u4f59\u5f26\u503c\u3002\u5982\u679cx\u8d85\u51fa\u4e86-1\u52301\u7684\u8303\u56f4\uff0cacos()\u51fd\u6570\u5c06\u8fd4\u56deNaN\uff08\u975e\u6570\u5b57\uff09\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b-UWNeqVTxJc\">\u793a\u4f8b<\/h2>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528acos()\u51fd\u6570\u7684\u793a\u4f8b\uff1a<\/p>\n<pre>\n&lt;?php\n$x = 0.5;\n$acos = acos($x);\necho \"acos($x)\u7684\u503c\u662f\uff1a\" . $acos;\n?&gt;\n<\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre>\nacos(0.5)\u7684\u503c\u662f\uff1a1.0471975511966\n<\/pre>\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528acos()\u51fd\u6570\u8ba1\u7b97\u4e860.5\u7684\u53cd\u4f59\u5f26\u503c\uff0c\u5e76\u5c06\u7ed3\u679c\u5b58\u50a8\u5728\u53d8\u91cf$acos\u4e2d\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528echo\u8bed\u53e5\u5c06\u7ed3\u679c\u8f93\u51fa\u5230\u5c4f\u5e55\u4e0a\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a1%b9-UWNeqVTxJc\">\u6ce8\u610f\u4e8b\u9879<\/h2>\n<p>\u5728\u4f7f\u7528acos()\u51fd\u6570\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul>\n<li>\u53c2\u6570x\u5fc5\u987b\u662f\u4e00\u4e2a\u4ecb\u4e8e-1\u548c1\u4e4b\u95f4\u7684\u6570\u503c\uff0c\u8868\u793a\u4f59\u5f26\u503c\u3002\u5982\u679cx\u8d85\u51fa\u4e86\u8fd9\u4e2a\u8303\u56f4\uff0cacos()\u51fd\u6570\u5c06\u8fd4\u56deNaN\u3002<\/li>\n<li>acos()\u51fd\u6570\u8fd4\u56de\u7684\u89d2\u5ea6\u662f\u4e00\u4e2a\u5f27\u5ea6\u503c\uff0c\u4ecb\u4e8e0\u548c\u03c0\u4e4b\u95f4\u3002\u5982\u679c\u9700\u8981\u5c06\u5176\u8f6c\u6362\u4e3a\u5ea6\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528rad2deg()\u51fd\u6570\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%bb%93%e8%ae%ba-UWNeqVTxJc\">\u7ed3\u8bba<\/h2>\n<p>\u5728PHP\u7f16\u7a0b\u4e2d\uff0cacos()\u51fd\u6570\u662f\u4e00\u4e2a\u7528\u4e8e\u8ba1\u7b97\u4e00\u4e2a\u6570\u7684\u53cd\u4f59\u5f26\u503c\u7684\u6570\u5b66\u51fd\u6570\u3002\u5b83\u8fd4\u56de\u4e00\u4e2a\u4ecb\u4e8e0\u548c\u03c0\u4e4b\u95f4\u7684\u89d2\u5ea6\uff0c\u8868\u793a\u7ed9\u5b9a\u6570\u7684\u53cd\u4f59\u5f26\u503c\u3002\u901a\u8fc7\u4f7f\u7528acos()\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u5728PHP\u7a0b\u5e8f\u4e2d\u8ba1\u7b97\u4efb\u610f\u6570\u7684\u53cd\u4f59\u5f26\u503c\uff0c\u5e76\u8fdb\u884c\u8fdb\u4e00\u6b65\u7684\u5904\u7406\u548c\u8ba1\u7b97\u3002<\/p>\n<h2 id=\"summary-section-UWNeqVTxJc\">Summary Section<\/h2>\n<p>\u9999\u6e2f\u670d\u52a1\u5668\u9996\u9009\u540e\u6d6a\u4e91\u662f\u4e00\u4e2a\u63d0\u4f9b\u9ad8\u8d28\u91cf\u4e91\u8ba1\u7b97\u670d\u52a1\u7684\u516c\u53f8\u3002\u4ed6\u4eec\u7684\u4ea7\u54c1\u5305\u62ec\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u548c\u4e91\u670d\u52a1\u5668\u3002\u5982\u679c\u60a8\u9700\u8981\u53ef\u9760\u7684\u670d\u52a1\u5668\u548c\u4e91\u8ba1\u7b97\u89e3\u51b3\u65b9\u6848\uff0c\u540e\u6d6a\u4e91\u662f\u60a8\u7684\u9996\u9009\u3002\u60a8\u53ef\u4ee5\u8bbf\u95ee\u4ed6\u4eec\u7684\u5b98\u7f51\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff1a<a href=\"https:\/\/idc.net\">https:\/\/idc.net<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PHP\u51fd\u6570\uff1aacos \u5728PHP\u7f16\u7a0b\u4e2d\uff0cacos()\u51fd\u6570\u662f\u4e00\u4e2a\u7528\u4e8e\u8ba1\u7b97\u4e00\u4e2a\u6570\u7684\u53cd\u4f59\u5f26\u503c\u7684\u6570\u5b66\u51fd\u6570\u3002\u5b83\u8fd4\u56de\u4e00\u4e2a\u4ecb\u4e8e [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[197851],"tags":[],"class_list":["post-217863","post","type-post","status-publish","format-standard","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217863","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=217863"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217863\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=217863"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=217863"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=217863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}