{"id":2545,"date":"2017-07-31T17:32:52","date_gmt":"2017-07-31T09:32:52","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=2545"},"modified":"2024-11-15T11:25:15","modified_gmt":"2024-11-15T03:25:15","slug":"php-%e5%8f%98%e9%87%8f","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/jishu\/chengxujiaoben\/php\/php-%e5%8f%98%e9%87%8f\/","title":{"rendered":"PHP \u53d8\u91cf"},"content":{"rendered":"<div>\n<p>\u53d8\u91cf\u662f\u5b58\u50a8\u4fe1\u606f\u7684\u5bb9\u5668\uff1a<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<pre>&lt;?php\r\n$x=5;\r\n$y=6;\r\n$z=$x+$y;\r\necho $z;\r\n?&gt;\r\n<\/pre>\n<p class=\"tiy\">\n<\/div>\n<div>\n<h2>\u7c7b\u4f3c\u4ee3\u6570<\/h2>\n<pre>x=5\r\ny=6\r\nz=x+y\r\n<\/pre>\n<p>\u5728\u4ee3\u6570\u4e2d\u6211\u4eec\u4f7f\u7528\u5b57\u6bcd\uff08\u6bd4\u5982 x\uff09\u6765\u4fdd\u5b58\u503c\uff08\u6bd4\u5982 5\uff09\u3002<\/p>\n<p>\u4ece\u4e0a\u9762\u7684\u8868\u8fbe\u5f0f z=x+y\uff0c\u6211\u4eec\u80fd\u591f\u8ba1\u7b97\u51fa z \u7684\u503c\u662f 11\u3002<\/p>\n<p>\u5728 PHP \u4e2d\uff0c\u8fd9\u4e09\u4e2a\u5b57\u6bcd\u88ab\u79f0\u4e3a<em>\u53d8\u91cf<\/em>\u3002<\/p>\n<p class=\"note\">\u6ce8\u91ca\uff1a\u8bf7\u628a\u53d8\u91cf\u89c6\u4e3a\u5b58\u50a8\u6570\u636e\u7684\u5bb9\u5668\u3002<\/p>\n<p class=\"note\">\n<\/div>\n<div>\n<h2>PHP \u53d8\u91cf<\/h2>\n<p>\u6b63\u5982\u4ee3\u6570\uff0cPHP \u53d8\u91cf\u53ef\u7528\u4e8e\u4fdd\u5b58\u503c\uff08x=5\uff09\u548c\u8868\u8fbe\u5f0f\uff08z=x+y\uff09\u3002<\/p>\n<p>\u53d8\u91cf\u7684\u540d\u79f0\u53ef\u4ee5\u5f88\u77ed\uff08\u6bd4\u5982 x \u548c y\uff09\uff0c\u4e5f\u53ef\u4ee5\u53d6\u66f4\u5177\u63cf\u8ff0\u6027\u7684\u540d\u79f0\uff08\u6bd4\u5982 carname\u3001total_volume\uff09\u3002<\/p>\n<h3>PHP \u53d8\u91cf\u89c4\u5219\uff1a<\/h3>\n<ul>\n<li>\u53d8\u91cf\u4ee5 $ \u7b26\u53f7\u5f00\u5934\uff0c\u5176\u540e\u662f\u53d8\u91cf\u7684\u540d\u79f0<\/li>\n<li>\u53d8\u91cf\u540d\u79f0\u5fc5\u987b\u4ee5\u5b57\u6bcd\u6216\u4e0b\u5212\u7ebf\u5f00\u5934<\/li>\n<li>\u53d8\u91cf\u540d\u79f0\u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934<\/li>\n<li>\u53d8\u91cf\u540d\u79f0\u53ea\u80fd\u5305\u542b\u5b57\u6bcd\u6570\u5b57\u5b57\u7b26\u548c\u4e0b\u5212\u7ebf\uff08A-z\u30010-9 \u4ee5\u53ca _\uff09<\/li>\n<li>\u53d8\u91cf\u540d\u79f0\u5bf9\u5927\u5c0f\u5199\u654f\u611f\uff08$y \u4e0e $Y \u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u53d8\u91cf\uff09<\/li>\n<\/ul>\n<p class=\"note\">\u6ce8\u91ca\uff1aPHP \u53d8\u91cf\u540d\u79f0\u5bf9\u5927\u5c0f\u5199\u654f\u611f\uff01<\/p>\n<\/div>\n<div>\n<h2>\u521b\u5efa PHP \u53d8\u91cf<\/h2>\n<p>PHP \u6ca1\u6709\u521b\u5efa\u53d8\u91cf\u7684\u547d\u4ee4\u3002<\/p>\n<p>\u53d8\u91cf\u4f1a\u5728\u9996\u6b21\u4e3a\u5176\u8d4b\u503c\u65f6\u88ab\u521b\u5efa\uff1a<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<pre>&lt;?php\r\n$txt=\"Hello world!\";\r\n$x=5;\r\n$y=10.5;\r\n?&gt;\r\n<\/pre>\n<p class=\"tiy\">\n<p>\u4ee5\u4e0a\u8bed\u53e5\u6267\u884c\u540e\uff0c\u53d8\u91cf txt \u4f1a\u4fdd\u5b58\u503c Hello world!\uff0c\u53d8\u91cf x \u4f1a\u4fdd\u5b58\u503c 5\uff0c\u53d8\u91cf y \u4f1a\u4fdd\u5b58\u503c 10.5\u3002<\/p>\n<p class=\"note\">\u6ce8\u91ca\uff1a\u5982\u679c\u60a8\u4e3a\u53d8\u91cf\u8d4b\u7684\u503c\u662f\u6587\u672c\uff0c\u8bf7\u7528\u5f15\u53f7\u5305\u56f4\u8be5\u503c\u3002<\/p>\n<\/div>\n<div>\n<h2><\/h2>\n<h2>PHP \u662f\u4e00\u95e8\u7c7b\u578b\u677e\u6563\u7684\u8bed\u8a00<\/h2>\n<p>\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u8bf7\u6ce8\u610f\u6211\u4eec\u4e0d\u5fc5\u544a\u77e5 PHP \u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n<p>PHP \u6839\u636e\u5b83\u7684\u503c\uff0c\u81ea\u52a8\u628a\u53d8\u91cf\u8f6c\u6362\u4e3a\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n<p>\u5728\u8bf8\u5982 C \u548c C++ \u4ee5\u53ca Java \u4e4b\u7c7b\u7684\u8bed\u8a00\u4e2d\uff0c\u7a0b\u5e8f\u5458\u5fc5\u987b\u5728\u4f7f\u7528\u53d8\u91cf\u4e4b\u524d\u58f0\u660e\u5b83\u7684\u540d\u79f0\u548c\u7c7b\u578b\u3002<\/p>\n<\/div>\n<div>\n<h2>PHP \u53d8\u91cf\u4f5c\u7528\u57df<\/h2>\n<p>\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u5728\u811a\u672c\u7684\u4efb\u610f\u4f4d\u7f6e\u5bf9\u53d8\u91cf\u8fdb\u884c\u58f0\u660e\u3002<\/p>\n<p>\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u6307\u7684\u662f\u53d8\u91cf\u80fd\u591f\u88ab\u5f15\u7528\/\u4f7f\u7528\u7684\u90a3\u90e8\u5206\u811a\u672c\u3002<\/p>\n<p>PHP \u6709\u4e09\u79cd\u4e0d\u540c\u7684\u53d8\u91cf\u4f5c\u7528\u57df\uff1a<\/p>\n<ul>\n<li>local\uff08\u5c40\u90e8\uff09<\/li>\n<li>global\uff08\u5168\u5c40\uff09<\/li>\n<li>static\uff08\u9759\u6001\uff09<\/li>\n<\/ul>\n<\/div>\n<div>\n<h2>Local \u548c Global \u4f5c\u7528\u57df<\/h2>\n<p>\u51fd\u6570<em>\u4e4b\u5916<\/em>\u58f0\u660e\u7684\u53d8\u91cf\u62e5\u6709 Global \u4f5c\u7528\u57df\uff0c\u53ea\u80fd\u5728\u51fd\u6570\u4ee5\u5916\u8fdb\u884c\u8bbf\u95ee\u3002<\/p>\n<p>\u51fd\u6570<em>\u5185\u90e8<\/em>\u58f0\u660e\u7684\u53d8\u91cf\u62e5\u6709 LOCAL \u4f5c\u7528\u57df\uff0c\u53ea\u80fd\u5728\u51fd\u6570\u5185\u90e8\u8fdb\u884c\u8bbf\u95ee\u3002<\/p>\n<p>\u4e0b\u9762\u7684\u4f8b\u5b50\u6d4b\u8bd5\u4e86\u5e26\u6709\u5c40\u90e8\u548c\u5168\u5c40\u4f5c\u7528\u57df\u7684\u53d8\u91cf\uff1a<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<pre>&lt;?php\r\n$x=5; <span class=\"code_comment\">\/\/ \u5168\u5c40\u4f5c\u7528\u57df<\/span>\r\n\r\nfunction myTest() {\r\n  $y=10; <span class=\"code_comment\">\/\/ \u5c40\u90e8\u4f5c\u7528\u57df<\/span>\r\n  echo \"&lt;p&gt;\u6d4b\u8bd5\u51fd\u6570\u5185\u90e8\u7684\u53d8\u91cf\uff1a&lt;\/p&gt;\";\r\n  echo \"\u53d8\u91cf x \u662f\uff1a$x\";\r\n  echo \"&lt;br&gt;\";\r\n  echo \"\u53d8\u91cf y \u662f\uff1a$y\";\r\n} \r\n\r\nmyTest();\r\n\r\necho \"&lt;p&gt;\u6d4b\u8bd5\u51fd\u6570\u4e4b\u5916\u7684\u53d8\u91cf\uff1a&lt;\/p&gt;\";\r\necho \"\u53d8\u91cf x \u662f\uff1a$x\";\r\necho \"&lt;br&gt;\";\r\necho \"\u53d8\u91cf y \u662f\uff1a$y\";\r\n?&gt;\r\n<\/pre>\n<p class=\"tiy\">\n<p>\u5728\u4e0a\u4f8b\u4e2d\uff0c\u6709\u4e24\u4e2a\u53d8\u91cf $x \u548c $y\uff0c\u4ee5\u53ca\u4e00\u4e2a\u51fd\u6570 myTest()\u3002$x \u662f\u5168\u5c40\u53d8\u91cf\uff0c\u56e0\u4e3a\u5b83\u662f\u5728\u51fd\u6570\u4e4b\u5916\u58f0\u660e\u7684\uff0c\u800c $y \u662f\u5c40\u90e8\u53d8\u91cf\uff0c\u56e0\u4e3a\u5b83\u662f\u5728\u51fd\u6570\u5185\u58f0\u660e\u7684\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eec\u5728 myTest() \u51fd\u6570\u5185\u90e8\u8f93\u51fa\u4e24\u4e2a\u53d8\u91cf\u7684\u503c\uff0c$y \u4f1a\u8f93\u51fa\u5728\u672c\u5730\u58f0\u660e\u7684\u503c\uff0c\u4f46\u662f\u65e0\u6cd5 $x \u7684\u503c\uff0c\u56e0\u4e3a\u5b83\u5728\u51fd\u6570\u4e4b\u5916\u521b\u5efa\u3002<\/p>\n<p>\u7136\u540e\uff0c\u5982\u679c\u5728 myTest() \u51fd\u6570\u4e4b\u5916\u8f93\u51fa\u4e24\u4e2a\u53d8\u91cf\u7684\u503c\uff0c\u90a3\u4e48\u4f1a\u8f93\u51fa $x \u7684\u503c\uff0c\u4f46\u662f\u4e0d\u4f1a\u8f93\u51fa $y \u7684\u503c\uff0c\u56e0\u4e3a\u5b83\u662f\u5c40\u90e8\u53d8\u91cf\uff0c\u5e76\u4e14\u5728 myTest() \u5185\u90e8\u521b\u5efa\u3002<\/p>\n<p class=\"note\">\u6ce8\u91ca\uff1a\u60a8\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u51fd\u6570\u4e2d\u521b\u5efa\u540d\u79f0\u76f8\u540c\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u56e0\u4e3a\u5c40\u90e8\u53d8\u91cf\u53ea\u80fd\u88ab\u5728\u5176\u4e2d\u521b\u5efa\u5b83\u7684\u51fd\u6570\u8bc6\u522b\u3002<\/p>\n<\/div>\n<div>\n<h2><\/h2>\n<h2>PHP global \u5173\u952e\u8bcd<\/h2>\n<p>global \u5173\u952e\u8bcd\u7528\u4e8e\u8bbf\u95ee\u51fd\u6570\u5185\u7684\u5168\u5c40\u53d8\u91cf\u3002<\/p>\n<p>\u8981\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u8bf7\u5728\uff08\u51fd\u6570\u5185\u90e8\uff09\u53d8\u91cf\u524d\u9762\u4f7f\u7528 global \u5173\u952e\u8bcd\uff1a<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<pre>&lt;?php\r\n$x=5;\r\n$y=10;\r\n\r\nfunction myTest() {\r\n  global $x,$y;\r\n  $y=$x+$y;\r\n}\r\n\r\nmyTest();\r\necho $y; <span class=\"code_comment\">\/\/ \u8f93\u51fa 15<\/span>\r\n?&gt;\r\n<\/pre>\n<p class=\"tiy\">\n<p>PHP \u540c\u65f6\u5728\u540d\u4e3a $GLOBALS[index] \u7684\u6570\u7ec4\u4e2d\u5b58\u50a8\u4e86\u6240\u6709\u7684\u5168\u5c40\u53d8\u91cf\u3002\u4e0b\u6807\u5b58\u6709\u53d8\u91cf\u540d\u3002\u8fd9\u4e2a\u6570\u7ec4\u5728\u51fd\u6570\u5185\u4e5f\u53ef\u4ee5\u8bbf\u95ee\uff0c\u5e76\u80fd\u591f\u7528\u4e8e\u76f4\u63a5\u66f4\u65b0\u5168\u5c40\u53d8\u91cf\u3002<\/p>\n<p>\u4e0a\u9762\u7684\u4f8b\u5b50\u53ef\u4ee5\u8fd9\u6837\u91cd\u5199\uff1a<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<pre>&lt;?php\r\n$x=5;\r\n$y=10;\r\n\r\nfunction myTest() {\r\n  $GLOBALS['y']=$GLOBALS['x']+$GLOBALS['y'];\r\n} \r\n\r\nmyTest();\r\necho $y; <span class=\"code_comment\">\/\/ \u8f93\u51fa 15<\/span>\r\n?&gt;\r\n<\/pre>\n<p class=\"tiy\">\n<\/div>\n<div>\n<h2>PHP static \u5173\u952e\u8bcd<\/h2>\n<p>\u901a\u5e38\uff0c\u5f53\u51fd\u6570\u5b8c\u6210\/\u6267\u884c\u540e\uff0c\u4f1a\u5220\u9664\u6240\u6709\u53d8\u91cf\u3002\u4e0d\u8fc7\uff0c\u6709\u65f6\u6211\u9700\u8981\u4e0d\u5220\u9664\u67d0\u4e2a\u5c40\u90e8\u53d8\u91cf\u3002\u5b9e\u73b0\u8fd9\u4e00\u70b9\u9700\u8981\u66f4\u8fdb\u4e00\u6b65\u7684\u5de5\u4f5c\u3002<\/p>\n<p>\u8981\u5b8c\u6210\u8fd9\u4e00\u70b9\uff0c\u8bf7\u5728\u60a8\u9996\u6b21\u58f0\u660e\u53d8\u91cf\u65f6\u4f7f\u7528 <em>static<\/em> \u5173\u952e\u8bcd\uff1a<\/p>\n<h3>\u5b9e\u4f8b<\/h3>\n<pre>&lt;?php\r\n\r\nfunction myTest() {\r\n  static $x=0;\r\n  echo $x;\r\n  $x++;\r\n}\r\n\r\nmyTest();\r\nmyTest();\r\nmyTest();\r\n\r\n?&gt;\r\n<\/pre>\n<p class=\"tiy\">\n<p>\u7136\u540e\uff0c\u6bcf\u5f53\u51fd\u6570\u88ab\u8c03\u7528\u65f6\uff0c\u8fd9\u4e2a\u53d8\u91cf\u6240\u5b58\u50a8\u7684\u4fe1\u606f\u90fd\u662f\u51fd\u6570\u6700\u540e\u4e00\u6b21\u88ab\u8c03\u7528\u65f6\u6240\u5305\u542b\u7684\u4fe1\u606f\u3002<\/p>\n<p class=\"note\">\u6ce8\u91ca\uff1a\u8be5\u53d8\u91cf\u4ecd\u7136\u662f\u51fd\u6570\u7684\u5c40\u90e8\u53d8\u91cf\u3002<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u53d8\u91cf\u662f\u5b58\u50a8\u4fe1\u606f\u7684\u5bb9\u5668\uff1a \u5b9e\u4f8b &lt;?php $x=5; $y=6; $z=$x+$y; echo $z;  &#8230; <a title=\"PHP \u53d8\u91cf\" class=\"read-more\" href=\"https:\/\/cn.hostease.com\/xueyuan\/jishu\/chengxujiaoben\/php\/php-%e5%8f%98%e9%87%8f\/\" aria-label=\"\u9605\u8bfb PHP \u53d8\u91cf\">\u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[369,1464,1465,1463],"class_list":["post-2545","post","type-post","status-publish","format-standard","hentry","category-php","tag-php","tag-php-global","tag-php-static"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/2545","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/comments?post=2545"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/2545\/revisions"}],"predecessor-version":[{"id":2546,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/2545\/revisions\/2546"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/media?parent=2545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/categories?post=2545"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/tags?post=2545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}