{"id":217855,"date":"2023-12-23T01:23:22","date_gmt":"2023-12-22T17:23:22","guid":{"rendered":"https:\/\/www.idc.net\/help\/217855\/"},"modified":"2023-12-23T01:23:22","modified_gmt":"2023-12-22T17:23:22","slug":"php%e5%87%bd%e6%95%b0%ef%bc%9alog","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/217855\/","title":{"rendered":"PHP\u51fd\u6570\uff1alog"},"content":{"rendered":"<h1 id=\"php%e5%87%bd%e6%95%b0%ef%bc%9alog-MbvNxZYWzJ\">PHP\u51fd\u6570\uff1alog<\/h1>\n<p>\u5728PHP\u4e2d\uff0clog\u51fd\u6570\u662f\u4e00\u4e2a\u7528\u4e8e\u8ba1\u7b97\u81ea\u7136\u5bf9\u6570\u7684\u6570\u5b66\u51fd\u6570\u3002\u5b83\u53ef\u4ee5\u7528\u6765\u8ba1\u7b97\u4efb\u610f\u6570\u7684\u81ea\u7136\u5bf9\u6570\uff0c\u5373\u4ee5e\u4e3a\u5e95\u7684\u5bf9\u6570\u3002<\/p>\n<h2 id=\"%e8%af%ad%e6%b3%95-MbvNxZYWzJ\">\u8bed\u6cd5<\/h2>\n<p>log\u51fd\u6570\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>float log ( float $arg [, float $base = M_E ] )\n<\/code><\/pre>\n<p>\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n<ul>\n<li><code>$arg<\/code>: \u5fc5\u9700\uff0c\u8981\u8ba1\u7b97\u81ea\u7136\u5bf9\u6570\u7684\u6570\u503c\u3002<\/li>\n<li><code>$base<\/code>: \u53ef\u9009\uff0c\u6307\u5b9a\u5bf9\u6570\u7684\u5e95\u6570\uff0c\u9ed8\u8ba4\u4e3ae\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%bf%94%e5%9b%9e%e5%80%bc-MbvNxZYWzJ\">\u8fd4\u56de\u503c<\/h2>\n<p>log\u51fd\u6570\u8fd4\u56de\u6307\u5b9a\u6570\u503c\u7684\u81ea\u7136\u5bf9\u6570\u3002\u5982\u679c\u6307\u5b9a\u4e86\u5e95\u6570\uff0c\u5219\u8fd4\u56de\u4ee5\u6307\u5b9a\u5e95\u6570\u4e3a\u5e95\u7684\u5bf9\u6570\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b-MbvNxZYWzJ\">\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528log\u51fd\u6570\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>&lt;?php\n$num1 = 10;\n$num2 = 2;\n\n\/\/ \u8ba1\u7b9710\u7684\u81ea\u7136\u5bf9\u6570\n$result1 = log($num1);\necho \"log($num1) = $result1 &lt;br&gt;\";\n\n\/\/ \u8ba1\u7b972\u7684\u4ee510\u4e3a\u5e95\u7684\u5bf9\u6570\n$result2 = log($num2, 10);\necho \"log($num2, 10) = $result2 &lt;br&gt;\";\n?&gt;\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre><code>log(10) = 2.302585092994\nlog(2, 10) = 0.301029995664\n<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a1%b9-MbvNxZYWzJ\">\u6ce8\u610f\u4e8b\u9879<\/h2>\n<p>\u5728\u4f7f\u7528log\u51fd\u6570\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u6307\u5b9a\u7684\u6570\u503c\u5c0f\u4e8e\u7b49\u4e8e0\uff0c\u5219log\u51fd\u6570\u4f1a\u8fd4\u56defalse\u3002<\/li>\n<li>\u5982\u679c\u6307\u5b9a\u7684\u5e95\u6570\u5c0f\u4e8e\u7b49\u4e8e0\u6216\u7b49\u4e8e1\uff0c\u5219log\u51fd\u6570\u4f1a\u8fd4\u56defalse\u3002<\/li>\n<li>\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u5e95\u6570\uff0c\u5219log\u51fd\u6570\u4f1a\u4f7f\u7528e\u4f5c\u4e3a\u9ed8\u8ba4\u5e95\u6570\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%80%bb%e7%bb%93-MbvNxZYWzJ\">\u603b\u7ed3<\/h2>\n<p>\u901a\u8fc7log\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u8ba1\u7b97\u4efb\u610f\u6570\u7684\u81ea\u7136\u5bf9\u6570\u3002\u5b83\u5728\u6570\u5b66\u8ba1\u7b97\u3001\u6570\u636e\u5206\u6790\u7b49\u9886\u57df\u90fd\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\u3002<\/p>\n<h3 id=\"%e9%a6%99%e6%b8%af%e6%9c%8d%e5%8a%a1%e5%99%a8%e9%a6%96%e9%80%89%e5%90%8e%e6%b5%aa%e4%ba%91-MbvNxZYWzJ\">\u9999\u6e2f\u670d\u52a1\u5668\u9996\u9009\u540e\u6d6a\u4e91<\/h3>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5bfb\u627e\u53ef\u9760\u7684\u9999\u6e2f\u670d\u52a1\u5668\u63d0\u4f9b\u5546\uff0c\u540e\u6d6a\u4e91\u662f\u60a8\u7684\u9996\u9009\u3002\u6211\u4eec\u63d0\u4f9b\u9ad8\u6027\u80fd\u7684\u9999\u6e2f\u670d\u52a1\u5668\uff0c\u53ef\u6ee1\u8db3\u60a8\u7684\u5404\u79cd\u9700\u6c42\u3002\u8bf7\u8bbf\u95ee\u6211\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\uff1alog \u5728PHP\u4e2d\uff0clog\u51fd\u6570\u662f\u4e00\u4e2a\u7528\u4e8e\u8ba1\u7b97\u81ea\u7136\u5bf9\u6570\u7684\u6570\u5b66\u51fd\u6570\u3002\u5b83\u53ef\u4ee5\u7528\u6765\u8ba1\u7b97\u4efb\u610f\u6570\u7684\u81ea\u7136\u5bf9\u6570\uff0c\u5373 [&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-217855","post","type-post","status-publish","format-standard","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217855","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=217855"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217855\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=217855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=217855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=217855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}