{"id":42,"date":"2016-04-16T06:16:54","date_gmt":"2016-04-16T06:16:54","guid":{"rendered":"http:\/\/120.27.50.22\/wordpress\/?p=42"},"modified":"2016-04-16T06:16:54","modified_gmt":"2016-04-16T06:16:54","slug":"php%e6%b5%ae%e7%82%b9%e6%95%b0%e8%ae%a1%e7%ae%97%e7%b2%be%e5%ba%a6%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/www.homconnect.cn\/?p=42","title":{"rendered":"PHP\u6d6e\u70b9\u6570\u8ba1\u7b97\u7cbe\u5ea6\u95ee\u9898"},"content":{"rendered":"<p>$i = 2.3;<br \/>\necho ($i*100).&#8221;&lt;br&gt;&#8221;;<br \/>\n$r = intval($i*100, 2);<br \/>\necho $r;<\/p>\n<p>\/\/\u8f93\u51fa\u7ed3\u6784<\/p>\n<p>230<br \/>\n229<\/p>\n<p><strong>\u539f\u56e0<\/strong>\uff1a\u6d6e\u70b9\u6570\u7684\u4e0d\u7cbe\u786e\u5b58\u50a8\u9020\u6210\u7684<\/p>\n<p>\u5b58\u50a8\u662f\u8fd1\u4f3c\u503c\u6216\u8005\u6709\u4e9b\u8fd1\u4f3c\u503c\uff1d\u771f\u5b9e\u503c \u6709\u4e9b\u4e0d\u7b49\u4e8e<\/p>\n<p>\u89e3\u51b3\u65b9\u6848\uff0c\u4f7f\u7528 round() \u51fd\u6570<\/p>\n<p>\u6216\u8005\u00a0\u8bbe\u7f6e<br \/>\nini_set(&#8220;precision&#8221;, &#8220;12&#8221;);<br \/>\nini_set(&#8220;precision&#8221;, &#8220;4&#8221;);<\/p>\n<p>\u89c4\u5b9a\u6d6e\u70b9\u6570 \u901a\u7528\u7cbe\u5ea6\u4e3a4<br \/>\n\u8fd9\u6837 \u6240\u6709\u8ba1\u7b97 \u6bd4\u5982 1.234* 0.511<\/p>\n<p>\u603b\u662f\u4f1a\u5f97\u52301\u4e2a4\u4f4d\u5c0f\u6570\u7684\u6570\u503c\uff0c\u540e\u9762\u7684\u4f1a\u56db\u820d\u4e94\u5165<\/p>\n<p>\u5982\u679c\u4f60\u7684\u8ba1\u7b97 \u786e\u5b9a\u4e86\u6700\u540e\u7684\u5c0f\u6570\u70b9 \u53ef\u4ee5\u8bbe\u7f6ePHP\u652f\u6301\u5230\u6700\u540e\u7684\u4e00\u4f4d \u5269\u4e0b\u7684\u540e\u4e00\u4f4d\u4f1a\u81ea\u52a8\u56db\u820d\u4e94\u5165<\/p>\n<p>\u4e00\u822c\u6765\u8bb2 \u4f60\u53ef\u4ee5\u5b9a\u4e49\u5230 4\u4f4d\u6216\u8005 \u66f4\u9ad8\u768412\u4f4d \u786e\u5b9a\u4e0b\u6765\u540e \u5c31\u4e0d\u4f1a\u51fa\u73b0 299.9999999 \u8fd9\u6837\u7684\u503c\u4e86<\/p>\n<p>$num = 0.12345600000000000;<br \/>\n\/\/\u6574\u6570\u90e8\u5206\u4e3a0 \uff0c\u4f4d\u6570\u4e3a 0 \uff0c\u5c0f\u6570\u90e8\u5206\u672b\u5c3e\u7684 0 \u4e0d\u8ba1\u5165\u4f4d\u6570\uff0c\u6240\u4ee5\u603b\u4f4d\u6570\u4e3a 6<br \/>\nini_set(&#8220;precision&#8221;, &#8220;12&#8221;);<br \/>\necho $num; \/\/ 0.123456<br \/>\n\/\/\u672a\u8d85\u8fc7\u7cbe\u5ea6\u503c\uff0c\u663e\u793a\u7684\u7ed3\u679c\u4e3a 0.123456<br \/>\nini_set(&#8220;precision&#8221;, &#8220;3&#8221;);<br \/>\necho $num; \/\/ 0.123<br \/>\n\/\/\u8d85\u8fc7\u7cbe\u5ea6\u503c\uff0c\u4fdd\u75593\u4f4d<br \/>\nini_set(&#8220;precision&#8221;, &#8220;5&#8221;);<br \/>\necho $num; \/\/ 0.12346<br \/>\n\/\/\u8d85\u8fc7\u7cbe\u5ea6\u503c\uff0c\u4fdd\u75595\u4f4d<br \/>\n\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u7cbe\u5ea6\u503c\u7b49\u4ef7\u4e8e\u5c0f\u6570\u70b9\u540e\u4fdd\u7559\u51e0\u4f4d\u3002<br \/>\n\u6574\u6570\u90e8\u5206\u5927\u4e8e 0 \u60c5\u51b5<br \/>\n$num = 12.12345600000000000;<br \/>\n\/\/\u6574\u6570\u90e8\u5206\u4e3a12 \uff0c\u4f4d\u6570\u4e3a 2 \uff0c\u5c0f\u6570\u90e8\u5206\u672b\u5c3e\u7684 0 \u4e0d\u8ba1\u5165\u4f4d\u6570\uff0c\u4f4d\u6570\u4e3a6\uff0c\u6240\u4ee5\u603b\u4f4d\u6570\u4e3a 2 + 6<br \/>\nini_set(&#8220;precision&#8221;, &#8220;12&#8221;);<br \/>\necho $num; \/\/ 12.123456<br \/>\n\/\/\u672a\u8d85\u8fc7\u7cbe\u5ea6\u503c\uff0c\u663e\u793a\u7684\u7ed3\u679c\u4e3a 12.123456<\/p>\n<p>&nbsp;<\/p>\n<p>\u8ba1\u7b97\u673a\u5b58\u50a8 \u6d6e\u70b9\u6570\u90fd\u662f\u8fd9\u6837! \u8981\u4e48\u786e\u5b9a\u7cbe\u5ea6 \u8981\u4e48\u81ea\u5df1\u7528 round \u56db\u820d\u4e94\u5165<br \/>\n\u4e00\u4e2a\u662f\u6309\u9700 \u4e00\u4e2a\u662f\u5168\u5c40<\/p>\n","protected":false},"excerpt":{"rendered":"<p>$i = 2.3; echo ($i*100).&#8221;&lt;br&gt;&#8221;; $r =  &hellip; <a href=\"http:\/\/www.homconnect.cn\/?p=42\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cPHP\u6d6e\u70b9\u6570\u8ba1\u7b97\u7cbe\u5ea6\u95ee\u9898\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=\/wp\/v2\/posts\/42"}],"collection":[{"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=42"}],"version-history":[{"count":1,"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=\/wp\/v2\/posts\/42\/revisions"}],"predecessor-version":[{"id":43,"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=\/wp\/v2\/posts\/42\/revisions\/43"}],"wp:attachment":[{"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=42"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=42"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.homconnect.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=42"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}