{"id":23,"date":"2020-08-24T14:21:37","date_gmt":"2020-08-24T06:21:37","guid":{"rendered":"http:\/\/9iwd.top\/?p=23"},"modified":"2020-08-24T14:21:37","modified_gmt":"2020-08-24T06:21:37","slug":"no-8%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8bi","status":"publish","type":"post","link":"http:\/\/9iwd.top\/?p=23","title":{"rendered":"No.8\u6570\u636e\u7c7b\u578bI"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>&lt;?php\n\n\/*\n\u6570\u636e\u7c7b\u578b\u8be6\u8bf4\n#\u6574\u6570\u7c7b\n\n\u6574\u6570\u7c7b\u578b:\u4fdd\u5b58\u6574\u6570\u6570\u503c(\u8303\u56f4\u9650\u5236)\uff0c4\u4e2a\u5b57\u8282\u5b58\u50a8\u6570\u636e\uff0c\u6700\u5927\u5c31\u662f32\u4f4d: 42\u4ebf\u591a\u3002\u4f46\u662f\n\u5728PHP\u4e2d\u9ed8\u8ba4\u662f\u6709\u7b26\u53f7\u7c7b\u578b(\u533a\u5206\u6b63\u8d1f\u6570)\u3002\n\u5728PHP\u4e2d\u63d0\u4f9b\u4e86\u56db\u79cd\u6574\u578b\u7684\u5b9a\u4e49\u65b9\u5f0f:\u5341\u8fdb\u5236\u5b9a\u4e49\uff0c\u4e8c\u8fdb\u5236\u5b9a\u4e49\uff0c\u516b\u8fdb\u5236\u5b9a\u4e49\u548c\u5341\u516d\u8fdb\u5236\u5b9a\u4e49\u3002\n*\/\n$a1= 120;\t\/\/10\u8fdb\u5236;\n$a2=0b110;\t\/\/2\u8fdb\u5236\n$a3=0120;\t\/\/8\u8fdb\u5236\n$a4=0x120;\t\/\/16\u8fdb\u5236\n\necho $a1,',',$a2,',',$a3,',',$a4,'&lt;hr\/>';\n\n\/* \n#\u6574\u6570\u7c7b\u578b\n\n\u5341\u8fdb\u5236:\u902210\u8fdb1\uff0c\u80fd\u591f\u51fa\u73b0\u7684\u6570\u5b57\u662f0-9\u3002\n\u4e8c\u8fdb\u5236:\u90222\u8fdb1\uff0c\u80fd\u591f\u51fa\u73b0\u7684\u6570\u5b57\u662f0-1\u3002\n\u516b\u8fdb\u5236:\u90228\u8fdb1,\u80fd\u591f\u51fa\u73b0\u7684\u6570\u5b57\u662f0-7+\n\u5341\u516d\u8fdb\u5236:\u902216\u8fdb1\uff0c\u80fd\u591f\u51fa\u73b0\u7684\u6570\u5b57\u662f0-9\u4ee5\u53caa-f, a\u8868\u793a10,\u4f9d\u6b21\u7c7b\u63a8\u3002\n\n\u8fdb\u5236\u8f6c\u6362:\u624b\u52a8\u8f6c\u6362\n10\u8fdb\u5236\u8f6c\u4e8c\u8fdb\u5236:\u96642\u5012\u53d6\u4f59\u6cd5 \n\u4e0d\u7ba1\u5f97\u5230\u7684\u7ed3\u679c\u5982\u4f55\uff0c\u9700\u8981\u8865\u8db332\u4f4d:\u524d\u9762\u88650: 0000000 0000000 00000000 00001010\n10\u8fdb\u5236\u8f6c\u4e8c\u8fdb\u5236:\u53d6\u51fa\u6700\u5927\u76842\u7684N\u6b21\u65b9\uff0c\u76f4\u5230\u7ed3\u679c\u4e3a0\n\n\u4e8c\u8fdb\u5236\u5230\u5341\u8fdb\u5236\u4e4b\u95f4\u7684\u8f6c\u6362:\u4ece\u53f3\u4fa7\u5f00\u59cb\uff0c\u5c06\u5bf9\u5e94\u7684\u7b2c\u51e0\u4f4d\u4f5c\u4e3a2\u7684\u6307\u6570\uff0c\u7136\u540e\u5c06\u6240\u6709\u7684\u7ed3\u679c\u76f8\u52a0\n\nPHP\u4e2d\u4e0d\u9700\u8981\u7528\u6237\u8fd9\u4e48\u590d\u6742\u7684\u53bb\u8ba1\u7b97\uff0c\u63d0\u4f9b\u4e86\u5f88\u591a\u7684\u51fd\u6570\u8fdb\u884c\u8f6c\u6362\nDecbin():\u5341\u8fdb\u5236\u8f6c\u4e8c\u8fdb\u5236+\nDecoct():\u5341\u8fdb\u5236\u8f6c\u516b\u8fdb\u5236\u3002\nDechex():\u5341\u8fdb\u5236\u8f6c\u5341\u516d\u8fdb\u5236\nBindec():\u4e8c\u8fdb\u5236\u8f6c\u5341\u8fdb\u5236\n*\/\nvar_dump(decbin(107));\n\n\/* \n#\u6d6e\u70b9\u7c7b\u578b\n\n\u6d6e\u70b9\u578b:\u5c0f\u6570\u7c7b\u578b\u4ee5\u53ca\u8d85\u8fc7\u6574\u578b\u6240\u80fd\u5b58\u50a8\u8303\u56f4\u7684\u6574\u6570(\u4e0d\u4fdd\u8bc1\u7cbe\u5ea6)\uff0c\u7cbe\u5ea6\u8303\u56f4\u5927\u6982\u572815\n\u4e2a\u6709\u6548\u6570\u5b57\u5de6\u53f3\u3002\n\u6d6e\u70b9\u578b\u5b9a\u4e49\u6709\u4e24\u79cd\u65b9\u5f0f: *\/\n$f1= 1.23;\n$f2= 1.23e10; \t\t\t\/\/\u79d1\u5b66\u8ba1\u6570\u6cd5\uff0c\u5176\u4e2de\u8868\u793a\u5e9510%\n$f3=PHP_INT_MAX+1;\t\t\/\/\u6574\u5f62\u8d85\u8fc7\u6700\u5927\u503c\uff0c\u4f1a\u81ea\u52a8\u8f6c\u6362\u6210\u6d6e\u70b9\u578b\u5b58\u50a8\n\nvar_dump($f1,$f2,$f3);\necho '&lt;hr\/>';\n\n#\u6d6e\u70b9\u6570\u5224\u65ad\n$f4=0.7;\n$f5=2.1;\n$f6=$f5\/3;\n\nvar_dump($f4,$f5,$f6);\nvar_dump($f4==$f6);\t\t\/\/\u4e0d\u5efa\u8bae\u4f7f\u7528\u6d6e\u70b9\u578b\u6570\u636e\u8fdb\u884c\u5e03\u5c14\u5224\u65ad\uff0c\u56e0\u4e3a\u4e0d\u51c6\u786e\u3002\n\n#\u5e03\u5c14\u7c7b\u578b\n\n\/* \n\u5e03\u5c14\u7c7b\u578b:\u4e24\u4e2a\u503ctrue\u548cfalse,\u901a\u5e38\u662f\u7528\u4e8e\u5224\u65ad\u6bd4\u8f83\u3002\n\u5728\u8fdb\u884c\u67d0\u4e9b\u6570\u636e\u5224\u65ad\u7684\u65f6\u5019\uff0c\u9700\u8981\u7279\u522b\u6ce8\u610f\u7c7b\u578b\u8f6c\u6362\nEmpty():\u5224\u65ad\u6570\u636e\u7684\u503c\u662f\u5426\u4e3a\u201c\u7a7a\u201d\uff0c\u4e0d\u662fNULL,\u5982\u679c\u4e3a\u7a7a\u8fd4\u56detrue,\u4e0d\u4e3a\u7a7a\u8fd4\u56defalse\nIsset():\u5224\u65ad\u6570\u636e\u5b58\u50a8\u7684\u53d8\u91cf\u672c\u8eab\u662f\u5426\u5b58\u5728\uff0c\u5b58\u5728\u53d8\u91cf\u8fd4\u56detrue,\u4e0d\u5b58\u5728\u8fd4\u56defalse *\/\n\n\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[3],"_links":{"self":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts\/23"}],"collection":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23"}],"version-history":[{"count":0,"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts\/23\/revisions"}],"wp:attachment":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}