{"id":64,"date":"2020-09-29T21:27:13","date_gmt":"2020-09-29T13:27:13","guid":{"rendered":"http:\/\/9iwd.top\/?p=64"},"modified":"2020-09-29T21:27:13","modified_gmt":"2020-09-29T13:27:13","slug":"no-18-%e4%bd%9c%e7%94%a8%e5%9f%9f","status":"publish","type":"post","link":"http:\/\/9iwd.top\/?p=64","title":{"rendered":"No.18 \u4f5c\u7528\u57df"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>\/*\n\t\u4f5c\u7528\u57df\n\n\u4f5c\u7528\u57df:\u53d8\u91cf\uff08\u5e38\u91cf\uff09\u80fd\u591f\u88ab\u8bbf\u95ee\u7684\u533a\u57df\n1\u3001\u53d8\u91cf\u53ef\u4ee5\u5728\u666e\u901a\u4ee3\u7801\u4e2d\u5b9a\u4e49\n2\u3001\u53d8\u91cf\u4e5f\u53ef\u4ee5\u5728\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\n\n\u5728PHP\u4e2d\u4f5c\u7528\u57df\u4e25\u683c\u6765\u8bf4\u5206\u4e3a\u4e24\u79cd:\u4f46\u662fPHP\u5185\u90e8\u8fd8\u5b9a\u4e49\u4e00\u4e9b\u5728\u4e25\u683c\u610f\u4e49\u4e4b\u5916\u7684\u4e00\u79cd\uff0c\u6240\u4ee5\u603b\u5171\u7b97\u4e09\u79cd:\n1\u3001\u5168\u5c40\u53d8\u91cf:\u5c31\u662f\u7528\u6237\u666e\u901a\u5b9a\u4e49\u7684\u53d8\u91cf\uff08\u51fd\u6570\u5916\u90e8\u5b9a\u4e49\uff09\n\t\u6240\u5c5e\u5168\u5c40\u7a7a\u95f4:\u5728PHP\u4e2d\u53ea\u5141\u8bb8\u5728\u5168\u5c40\u7a7a\u95f4\u4f7f\u7528:\u7406\u8bba\u4e0a\u51fd\u6570\u5185\u90e8\u4e0d\u53ef\u8bbf\u95ee\n\t\u811a\u672c\u5468\u671f:\u76f4\u5230\u811a\u672c\u8fd0\u884c\u7ed3\u675f\uff08\u6700\u540e\u4e00\u884c\u4ee3\u7801\u6267\u884c\u5b8c\u3009\n\n2\u3001\u5c40\u90e8\u53d8\u91cf:\u5c31\u662f\u5728\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u7684\u53d8\u91cf\n\t\u6240\u5c5e\u5f53\u524d\u51fd\u6570\u7a7a\u95f4:\u5728PHP\u4e2d\u53ea\u5141\u8bb8\u5728\u5f53\u524d\u51fd\u6570\u81ea\u5df1\u5185\u90e8\u4f7f\u7528\n\t\u51fd\u6570\u5468\u671f:\u51fd\u6570\u6267\u884c\u7ed3\u675f\uff08\u51fd\u6570\u662f\u5728\u6808\u533a\u4e2d\u5f00\u8f9f\u72ec\u7acb\u5185\u5b58\u7a7a\u95f4\u8fd0\u884c\uff09\n\n3\u3001\u8d85\u5168\u5c40\u53d8\u91cf:\u7cfb\u7edf\u5b9a\u4e49\u7684\u53d8\u91cf\uff08\u9884\u5b9a\u4e49\u53d8\u91cf:$_SERVER\u3001$_POST\u7b49\uff09\n\t\u6240\u5c5e\u8d85\u5168\u5c40\u7a7a\u95f4:\u6ca1\u6709\u8bbf\u95ee\u9650\u5236\uff08\u51fd\u6570\u5185\u5916\u90fd\u53ef\u4ee5\u8bbf\u95ee\uff09\n*\/\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>*\/\n\n\/\/\u9ed8\u8ba4\u7684\u4ee3\u7801\u7a7a\u95f4\uff1a\u5168\u5c40\u7a7a\u95f4\n\/\/\u6700\u7ec8\u4f1a\u88ab\u7cfb\u7edf\u7eb3\u5165\u5230\u8d85\u5168\u5c40\u53d8\u91cf\u4e2d\uff1a$GLOBALS&#91;'global'] = 'global area';\n$global = 'global area';\n\n\/\/\u5c40\u90e8\u53d8\u91cf\uff08\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\uff09\nfunction display(){\n\t\/\/\u6240\u6709\u7684\u5f62\u53c2\u90fd\u53ef\u4ee5\u7406\u89e3\u4e3a\u5c40\u90e8\u53d8\u91cf\n\t$inner = __FUNCTION__;\n\t\n\t\/\/\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\n\t\/\/echo $global;\t\t\t\t\/\/\u5f53\u524d\u4e0d\u5b58\u5728\u8bbf\u95ee\u62a5\u9519\n\t\n\t\/\/\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\n\tvar_dump($GLOBALS);\t\t\t\/\/\u8bbf\u95ee\u8d85\u5168\u5c40\u53d8\u91cf\n\techo $GLOBALS&#91;'global'];\t\/\/\u4f7f\u7528\u8d85\u5168\u5c40\u53d8\u91cf\u4e0b\u6807\u8bbf\u95ee\n\t\n\t\/\/\u8f93\u51fa\u5c40\u90e8\u53d8\u91cf\n\techo $inner;\n}\n\n\n\/\/\u8bbf\u95ee\u51fd\u6570\ndisplay();\necho '&lt;br\/>';\n\/\/\u8f93\u51fa\u5c40\u90e8\u53d8\u91cf\necho $inner;\t\t\n\/\/\u5f53\u524d\u8bbf\u95ee\u4f1a\u62a5\u9519\uff0c\u56e0\u4e3a\u51fd\u6570\u8c03\u7528\u5b8c\u6210\u4e4b\u540e\u4f1a\u91ca\u653e\uff0c\u6240\u4ee5\u5c40\u90e8\u53d8\u91cf\u4e0d\u5b58\u5728\u3002\n\/\/\u5982\u679c\u60f3\u51fd\u6570\u5185\u90e8\u4f7f\u7528\u5916\u90e8\u53d8\u91cf\uff1a\u9664\u4e86 $GLOBALS \u4e4b\u5916\uff0c\u901a\u8fc7\u53c2\u6570\u4f20\u503c(\u5982\u679c\u8981\u7edf\u4e00\u6218\u7ebf\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5f15\u7528\u4f20\u503c)\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/*\n\u5728 PHP \u4e2d\u5176\u5b9e\u8fd8\u6709\u4e00\u79cd\u65b9\u5f0f\uff0c\u80fd\u591f\u5b9e\u73b0\u5168\u5c40\u8bbf\u95ee\u5c40\u90e8\uff0c\u540c\u65f6\u5c40\u90e8\u4e5f\u53ef\u4ee5\u5168\u5c40\u8bbf\u95ee\uff1aglobal \u5173\u952e\u5b57\n\nglobal \u5173\u952e\u5b57\uff1a\u662f\u4e00\u79cd\u5728\u51fd\u6570\u91cc\u9762\u5b9a\u4e49\u53d8\u91cf\u7684\u4e00\u79cd\u65b9\u5f0f\n1\u3001\u5982\u679c\u4f7f\u7528 global \u5b9a\u4e49\u7684\u53d8\u91cf\u540d\u5728\u5916\u90e8\u5b58\u5728\uff08\u5168\u5c40\u53d8\u91cf\uff09\uff0c\u90a3\u4e48\u7cfb\u7edf\u5728\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u7684\u53d8\u91cf\u76f4\u63a5\u6307\u5411\u5916\u90e8\u5168\u5c40\u53d8\u91cf\u6240\u6307\u5411\u7684\u5185\u5b58\u7a7a\u95f4\uff08\u540c\u4e00\u4e2a\u53d8\u91cf\uff09\n2\u3001\u5982\u679c\u4f7f\u7528 global \u5b9a\u4e49\u7684\u53d8\u91cf\u540d\u5728\u5916\u90e8\u4e0d\u5b58\u5728\uff08\u5168\u5c40\u53d8\u91cf\uff09\uff0c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u5728\u5168\u5c40\u7a7a\u95f4\uff08\u5916\u90e8\uff09\u5b9a\u4e49\u4e00\u4e2a\u4e0e\u5c40\u90e8\u53d8\u91cf\u540c\u547d\u7684\u5168\u5c40\u53d8\u91cf\n\n\u672c\u8d28\u7684\u5f62\u5f0f\uff1a\u5728\u51fd\u6570\u7684\u5185\u90e8\u548c\u5916\u90e8\uff0c\u5bf9\u4e00\u4e2a\u540c\u540d\u53d8\u91cf\uff08\u5168\u5c40\u548c\u5c40\u90e8\uff09\u4f7f\u7528\u540c\u4e00\u5757\u5185\u5b58\u5730\u5740\u4fdd\u5b58\u6570\u636e\uff0c\u4ece\u800c\u5b9e\u73b0\u5171\u540c\u62e5\u6709\u3002\n\n\u57fa\u672c\u8bed\u6cd5\uff1a\nglobal \u53d8\u91cf\u540d;\t\t\/\/\u4e0d\u80fd\u76f4\u63a5\u8d4b\u503c\n\u53d8\u91cf\u540d = \u503c;\t\t\/\/\u4fee\u6539\u8d4b\u503c\n*\/\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>function display1(){\n\t\/\/global \u5173\u952e\u5b57\u5b9a\u4e49\u5168\u5c40\u53d8\u91cf\n\tglobal $local;\n\t$local = 'inner';\n\n}\n\ndisplay1();\necho $local;\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/*\n\u603b\u7ed3\uff1a\n\u867d\u7136\u4ee5\u4e0a\u65b9\u5f0f\u53ef\u4ee5\u5b9e\u73b0\u5c40\u90e8\u4e0e\u5168\u5c40\u7684\u4e92\u8bbf\uff0c\u4f46\u662f\u901a\u5e38\u4e0d\u4f1a\u8fd9\u4e48\u505a\u3002\u4e00\u822c\u5982\u679c\u4f1a\u5b58\u5728\u7279\u6b8a\u4f7f\u7528\u4e5f\u4f1a\u4f7f\u7528\u53c2\u6570\u7684\u5f62\u5f0f\u6765\u8bbf\u95ee\u3002\uff08\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5e38\u91cf\uff1adefine \u5b9a\u4e49\u7684\uff09\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":[],"_links":{"self":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts\/64"}],"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=64"}],"version-history":[{"count":0,"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts\/64\/revisions"}],"wp:attachment":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=64"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=64"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=64"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}