{"id":93176,"date":"2020-03-30T13:38:09","date_gmt":"2020-03-30T05:38:09","guid":{"rendered":"http:\/\/4563.org\/?p=93176"},"modified":"2020-03-30T13:38:09","modified_gmt":"2020-03-30T05:38:09","slug":"php-%e4%b8%ad-object-%e4%b8%ba%e4%bb%80%e4%b9%88%e9%9c%80%e8%a6%81%e8%87%aa%e8%ba%ab%e7%bb%b4%e6%8a%a4%e4%b8%80%e4%b8%aa-refcount","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=93176","title":{"rendered":"PHP \u4e2d Object \u4e3a\u4ec0\u4e48\u9700\u8981\u81ea\u8eab\u7ef4\u62a4\u4e00\u4e2a refcount?"},"content":{"rendered":"
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PHP \u4e2d Object \u4e3a\u4ec0\u4e48\u9700\u8981\u81ea\u8eab\u7ef4\u62a4\u4e00\u4e2a refcount? <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : xiangxihenli <\/span> <\/i> 23<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u521a\u521a\u5728\u770b\u9e1f\u54e5\u7684\u6df1\u5165\u7406\u89e3 PHP7 \u5185\u6838\u4e4b OBJECT, \u91cc\u9762\u63d0\u5230\uff1a<\/p>\n

zend_object(\u4ee5\u4e0b\u7b80\u79f0 object)\u5728 PHP5 \u4e2d\u5176\u5b9e\u662f\u4e00\u79cd\u76f8\u5bf9\u7279\u6b8a\u7684\u5b58\u5728\uff0c \u5728 PHP5 \u4e2d\uff0c\u53ea\u6709 resource \u548c object \u662f\u5f15\u7528\u4f20\u9012\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728\u8d4b\u503c\uff0c\u4f20\u9012\u7684\u65f6\u5019\u90fd\u662f\u4f20\u9012\u7684\u672c\u8eab\uff0c\u4e5f\u6b63\u56e0\u4e3a\u5982\u6b64\uff0cObject \u548c Resource \u9664\u4e86\u4f7f\u7528\u4e86 Zval \u7684\u5f15\u7528\u8ba1\u6570\u4ee5\u5916\uff0c\u8fd8\u91c7\u7528\u4e86\u4e00\u5957\u72ec\u7acb\u81ea\u8eab\u7684\u8ba1\u6570\u7cfb\u7edf\u3002<\/p>\n

<?php $o1 = new Stdclass(); \/\/o1.refcount == 1, object.refcount == 1 $o2 = $o1; \/\/o1.refcount == o2.refcoun == 2; object.refcount = 1; $o3 = &$o2; \/\/o3.isref == o2.isref==1 \/\/o3.refcount == o2.refcount == 2 \/\/o1.isref == 0; o1.refcount == 1 \/\/object.refcount == 2 <\/code><\/pre>\n
\u8fd9\u6837\uff0c\u53ef\u4ee5\u8ba9 object \u53ef\u4ee5\u4fdd\u8bc1\u4e0d\u540c\u4e8e\u666e\u901a\u7684 zval \u7684 COW \u673a\u5236\uff0c\u53ef\u4ee5\u4fdd\u8bc1 object \u53ef\u4ee5\u5168\u5c40\u4f20\u5f15\u7528\u3002<\/p>\n
\u5b9e\u5728\u6ca1\u60f3\u6ca1\u767d\u4e3a\u4ec0\u4e48\u9700\u8981\u81ea\u8eab\u7ef4\u62a4\u4e00\u4e2a\u8ba1\u6570\u7cfb\u7edf\uff1f\u6c42\u5927\u795e\u6307\u70b9..<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (3<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
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     \u8cc7\u6df1\u5927\u4f6c : brzhang <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6211\u60f3\u5230\u4e00\u4e2a\u7406\u7531\uff0c\u4e3a\u4e86\u81ea\u52a8\u5783\u573e\u56de\u6536\u3002\u5f15\u7528\u8ba1\u6570\u7684\u611f\u89c9                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : xiangxihenli <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @brzhang \u55ef\uff1f\u8bb2\u8bb2..\u6211\u662f\u6ca1\u6709\u60f3\u660e\u767d                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : zilan <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e3a\u4e86\u81ea\u52a8 gc
    $a = new StdClass();
    $b = $a; \/\/\u6b64\u65f6$b \u4f1a\u5f15\u7528\u5230$a 
    \u67d0\u79cd\u60c5\u51b5\u4e0b unset($a)\uff0c\u4f46\u6b64\u65f6$b \u8fd8\u5728\u3002\u9700\u8981\u5728 Object \u4e2d\u7ef4\u62a4\u4e00\u4e2a\u5f15\u7528\u8ba1\u6570\uff0c\u4e86\u89e3\u76ee\u524d\u81ea\u8eab\u88ab\u5f15\u7528\u7684\u6570\u91cf\u3002
    $a \u5728 gc \u65f6\u4f1a\u8ba1\u7b97\u672c\u8eab\u7684\u5f15\u7528\u8ba1\u6570\uff0c\u4ece\u800c\u786e\u8ba4\u8fd8\u6709\u6ca1\u6709\u522b\u7684\u5728\u7528\uff0c\u6765\u786e\u8ba4\u80fd\u4e0d\u80fd\u56de\u6536\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    PHP \u4e2d Object \u4e3a\u4ec0\u4e48\u9700…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/93176"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=93176"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/93176\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=93176"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=93176"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=93176"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}