{"id":991,"date":"2019-08-29T09:17:32","date_gmt":"2019-08-29T01:17:32","guid":{"rendered":"https:\/\/wyxxt.org.cn\/?p=991"},"modified":"2023-12-04T15:51:59","modified_gmt":"2023-12-04T07:51:59","slug":"php%e5%bc%95%e7%94%a8%e3%80%81%e4%bc%a0%e5%80%bc%e3%80%81%e4%bc%a0%e5%9d%80%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/wyxxt.org.cn\/?p=991","title":{"rendered":"PHP\u4f20\u503c\u4e0e\u4f20\u5740\u7684\u533a\u522b"},"content":{"rendered":"

\u53d8\u91cf\u5728\u5185\u5b58\u4e2d<\/h3>\n

\u9996\u5148,\u8981\u7406\u89e3\u53d8\u91cf\u540d\u5b58\u50a8\u5728\u5185\u5b58\u6808\u4e2d,\u5b83\u662f\u6307\u5411\u5806\u4e2d\u5177\u4f53\u5185\u5b58\u7684\u5730\u5740,\u901a\u8fc7\u53d8\u91cf\u540d\u67e5\u627e\u5806\u4e2d\u7684\u5185\u5b58;
\n\u666e\u901a\u4f20\u503c\uff1a\u4f20\u503c\u4ee5\u540e,\u662f\u4e0d\u540c\u7684\u5730\u5740\u540d\u79f0,\u6307\u5411\u4e0d\u540c\u7684\u5185\u5b58\u5b9e\u4f53;
\n\u5f15\u7528\u4f20\u503c\uff1a\u4f20\u5f15\u7528\u540e,\u662f\u4e0d\u540c\u7684\u5730\u5740\u540d\u79f0,\u4f46\u90fd\u6307\u5411\u540c\u4e00\u4e2a\u5185\u5b58\u5b9e\u4f53;\u6539\u53d8\u5176\u4e2d\u4e00\u4e2a,\u53e6\u5916\u4e00\u4e2a\u5c31\u4e5f\u88ab\u6539\u53d8;
\n\u53d8\u91cf\u540d->\u5730\u5740->\u5185\u5b58\u5b9e\u4f53<\/p>\n

example<\/h3>\n
<?php\n\/\/\u666e\u901a\u4f20\u503c\n$param1=1; \n$param2=2; \n$param2 = $param1; \n$param1 = 5; \/\/\u53d8\u91cf1\u548c\u53d8\u91cf2\u662f\u4e24\u5757\u5185\u5b58,\u4e92\u4e0d\u5f71\u54cd;\necho $param2; \/\/\u6240\u4ee5\u6b64\u5904\u8fd8\u662f\u663e\u793a\u4e3a1\n\n\/\/\u5f15\u7528\u4f20\u503c \u2193\u2193\n$param1=1; \n$param2=2; \n$param2 = &$param1; \/\/\u628a\u53d8\u91cf1\u7684\u5185\u5b58\u5730\u5740\u8d4b\u7ed9\u53d8\u91cf2;\u6b64\u65f6\u7684\u53d8\u91cf2\u548c\u53d8\u91cf1\u5168\u7b49;\necho $param2;\/\/ 1\n$param1 = 5; \/\/\u53d8\u91cf1\u548c\u53d8\u91cf2\u662f\u4e00\u5904\u5185\u5b58,\u6539\u53d8\u5176\u4e2d\u4e00\u4e2a,\u53e6\u5916\u4e00\u4e2a\u4e5f\u88ab\u6539\u53d8;\necho $param2; \/\/\u663e\u793a\u4e3a5\n?>\n<\/code><\/pre>\n
<?php\n\/\/\u51fd\u6570\u4e2d\u7684\u666e\u901a\u4f20\u503c \u2193\u2193\n$param1 = 1; \nfunction add($param2){\n  $param2=3; \n}\n$param3=add($param1); \/\/\u8c03\u7528\u65b9\u6cd5add\uff0c\u5e76\u5c06\u53d8\u91cf1\u4f20\u7ed9\u53d8\u91cf2,\u6b64\u5904\u662f\u666e\u901a\u4f20\u503c,\u6240\u4ee5\u53d8\u91cf1\u548c\u53d8\u91cf2\u662f\u4e24\u5904\u5185\u5b58,\u4e92\u4e0d\u5f71\u54cd;\necho '<br>$param1=='.$param1.'<br>'; \/\/\u663e\u793a\u4e3a$param1==1\necho '<br>$param2=='.$param2.'<!-- <br> -->'; \/\/\u663e\u793a\u4e3a$param2== \u56e0\u4e3a$param2\u662f\u5c40\u90e8\u53d8\u91cf\uff0c\u51fd\u6570\u8fd0\u884c\u5b8c\u4e86\u4ee5\u540e\u5c31\u81ea\u52a8\u9500\u6bc1,\u5176\u4e0d\u80fd\u5f71\u54cd\u5168\u5c40\n\n\/\/\u51fd\u6570\u4e2d\u7684\u5f15\u7528\u4f20\u503c \u2193\u2193 \u6ce8\u610f,php\u4e0d\u5efa\u8bae\u8fd9\u6837\u4f7f\u7528,\u5e76\u4e14php.in\u91cc\u9762\u8bbe\u7f6e\u5176\u4f1a\u62a5\u9519;\n$param1 = 1; \nfunction add($param2){\n  $param2=3; \n  return $param2;\n}\n$param3=add(&$param1); \/\/\u8c03\u7528\u65b9\u6cd5add\uff0c\u5e76\u5c06\u53d8\u91cf1\u7684\u5f15\u7528\u4f20\u7ed9\u53d8\u91cf2,\u6b64\u65f6\u4e24\u4e2a\u5730\u5740\u6307\u5411\u540c\u4e00\u5185\u5b58,\u6539\u53d8\u5176\u4e2d\u4e00\u4e2a,\u53e6\u5916\u4e00\u4e2a\u4e5f\u8981\u88ab\u6539\u53d8;\necho $param1; \/\/3,\u5185\u5b58\u5df2\u5728\u51fd\u6570\u5185\u90e8\u6539\u53d8;\necho $param3; \/\/3 \n?>\n<\/code><\/pre>\n
unset()<\/h3>\n
$a = 1;\n$b = &$a;\nunset($a);\necho $b; \/\/??\n\n<\/code><\/pre>\n
\u4f46\u662f\u8981\u6ce8\u610f: unset\u5e76\u6ca1\u6709\u771f\u6b63\u9500\u6bc1\u53d8\u91cf\u7684\u4f5c\u7528\u2026\u4ec5\u4ec5\u662f\u5207\u65ad\u4e86\u53d8\u91cf\u4e0e\u5185\u5b58\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5185\u5b58\u53ea\u8981\u8fd8\u88ab\u5f15\u7528\u7740\u5c31\u4e0d\u4f1a\u88ab\u91ca\u653e;<\/strong> $b\u548c$a\u540c\u65f6\u6307\u54111,\u5207\u65ad\u5176\u4e2d$a\u7684\u5173\u7cfb,$b\u8fd8\u662f\u6307\u54111,\u6240\u4ee5\u4e0a\u9898\u4e0d\u62a5\u9519,\u7167\u6837\u8f93\u51fa1\u3002<\/p>\n
\u53e6\u5916\u8865\u5145\u4e00\u70b9\uff1a \u5728PHP\u4e2d\u5bf9\u8c61\u7684\u4f20\u503c\u9ed8\u8ba4\u662f\u5f15\u7528\u4f20\u503c<\/strong><\/p>\n
\u6790\u6784\u51fd\u6570<\/strong>\uff1a\u5bf9\u8c61\u9500\u6bc1\u65f6\u6267\u884c;\u6ce8\u610f\u5728\u9690\u5f0f\u9500\u6bc1\u4e2d\u662f\u5728\u6240\u6709php\u4ee3\u7801\u6267\u884c\u5b8c\u6700\u540e\u4e00\u884c\u4ee3\u7801\u7684\u65f6\u5019\u624d\u9500\u6bc1,\u8fd8\u6709\u8981\u6ce8\u610f\u5728\u5355\u5165\u53e3\u6587\u4ef6\u4e0b\u7684MVC\u6a21\u5f0f<\/p>\n
\u5bf9\u8c61\u7684\u9500\u6bc1\uff1a
\n\u663e\u8bd5\u9500\u6bc1<\/strong>\uff1a\u5f53\u5bf9\u8c61\u6ca1\u6709\u88ab\u5f15\u7528\u65f6\u5c31\u4f1a\u88ab\u9500\u6bc1,\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5unset\u6216\u4e3a\u5176\u8d4b\u503cNULL;
\n\u9690\u8bd5\u9500\u6bc1<\/strong>\uff1aPHP\u662f\u811a\u672c\u8bed\u8a00,\u5728\u4ee3\u7801\u6267\u884c\u5b8c\u6700\u540e\u4e00\u884c\u65f6,\u6240\u6709\u7533\u8bf7\u7684\u5185\u5b58\u90fd\u8981\u91ca\u653e\u6389.<\/p>\n
class Human {\n  public $name = '\u5f20\u4e09';\n  public $gender = null;\n  public function __destruct() {\n      echo '\u6b7b\u4e86!<br \/>';\n  }\n}\n$a = new Human();\n$b = $c = $d = $a;\nunset($a);\necho '<hr \/>';  \/\/\u6790\u6784\u51fd\u6570\u7a76\u7adf\u662f\u89e6\u53d1\u4e86\u51e0\u6b21,\u662f\u5728\u7ebf\u4e0a\u89e6\u53d1,\u8fd8\u662f\u5728\u7ebf\u4e0b\u89e6\u53d1?\n\n<\/code><\/pre>\n
\u7b54\u6848\uff1a
\n$b = $c = $d = $a;\u9ed8\u8ba4\u5f15\u7528\u4f20\u503c,\u56db\u4e2a\u53d8\u91cf\u6307\u5411\u540c\u4e00\u5904\u5185\u5b58\uff0cunset\u7684\u65f6\u5019\u5bf9\u8c61\u8fd8\u662f\u88ab\u8fd8\u662f\u5176\u5b83\u4e09\u4e2a\u53d8\u91cf\u4f7f\u7528\uff0c\u6240\u4ee5\u5bf9\u8c61\u5e76\u6ca1\u6709\u88ab\u9500\u6bc1\uff0c\u6240\u4ee5\u6790\u6784\u51fd\u6570\u662f\u5728\u7ebf\u4e0b\u89e6\u53d1\u7684\uff08\u4ee3\u7801\u6267\u884c\u5b8c\u4e86\uff0c\u5185\u5b58\u81ea\u52a8\u91ca\u653e\uff09<\/p>\n
class Human { \n  public $name = '\u5f20\u4e09'; \n  public $gender = null; \n\n  public function __destruct() { \n      echo '\u6b7b\u4e86!<br \/>'; \n  } \n} \n$e = $f = $g = new Human(); \nunset($e); \nunset($f); \nunset($g); \necho '<hr \/>'; \/\/\u540c\u6837\u7684\u95ee\u9898: \u6790\u6784\u51fd\u6570\u662f\u5728\u7ebf\u4e0a\u89e6\u53d1\u8fd8\u662f\u7ebf\u4e0b\u89e6\u53d1?\n<\/code><\/pre>\n
\u7ebf\u4e0a\uff0c\u4e00\u6b21<\/p>\n","protected":false},"excerpt":{"rendered":"
\u53d8\u91cf\u5728\u5185\u5b58\u4e2d \u9996\u5148,\u8981\u7406\u89e3\u53d8\u91cf\u540d\u5b58\u50a8\u5728\u5185\u5b58\u6808\u4e2d,\u5b83\u662f\u6307\u5411\u5806\u4e2d\u5177\u4f53\u5185\u5b58\u7684\u5730\u5740,\u901a\u8fc7\u53d8\u91cf\u540d\u67e5\u627e\u5806\u4e2d\u7684\u5185\u5b58; \u666e\u901a\u4f20 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[405],"class_list":["post-991","post","type-post","status-publish","format-standard","hentry","category-15","tag-php"],"_links":{"self":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=991"}],"version-history":[{"count":3,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/991\/revisions"}],"predecessor-version":[{"id":1176,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/991\/revisions\/1176"}],"wp:attachment":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}