{"id":433,"date":"2020-06-24T11:20:55","date_gmt":"2020-06-24T03:20:55","guid":{"rendered":"http:\/\/www.leohe.net.cn\/?p=433"},"modified":"2020-06-24T11:25:57","modified_gmt":"2020-06-24T03:25:57","slug":"php-copy-on-write-%e5%86%99%e6%97%b6%e5%a4%8d%e5%88%b6%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/china-abc.leohe.net.cn\/?p=433","title":{"rendered":"PHP copy on write \u5199\u65f6\u590d\u5236\u673a\u5236"},"content":{"rendered":"<p>\u5c31\u662f\u5728\u5199\u5165\u65f6\u624d\u771f\u6b63\u590d\u5236\u4e00\u4efd\u5185\u5b58\u8fdb\u884c\u4fee\u6539\uff0c\u4e3e\u4f8b\uff1a<\/p>\n<pre>$i = 4;   \r\n\/\/\u5185\u6838\u521b\u5efa\u4e00\u4e2azval\u6307\u9488\uff0c\u5e76\u4e14\u4e3a\u5176\u4ee5\u5806\u7684\u65b9\u5f0f\u5f00\u8f9f\u7a7a\u95f4\uff0c\u8ba9\u6307\u9488\u6307\u5411\u8fd9\u4e2a\u7a7a\u95f4\uff0c\r\n\/\/\u5c06zval\u4e2d\u7684\u6210\u5458\u5f15\u7528\u8ba1\u6570\u7f6e\u4e3a1\uff0c\u7c7b\u578b\u6807\u8bb0\u4e3a\u6574\u5f62\uff0c\u5e76\u4e14\u7533\u8bf7\u4e00\u4e2azvalue_value\u6307\u9488\uff0c\r\n\/\/\u540c\u6837\u4ee5\u5806\u7684\u65b9\u5f0f\u4ee5\u5176\u5f00\u8f9f\u7a7a\u95f4,\u540c\u65f6\u5c06\u8be5\u8054\u5408\u4f53\u4e2d\u7684lval\u8d4b\u503c\u4e3a4,\r\n\/\/\u5e76\u4e14\u5728symbal_table\u7684hash\u8868\u4e2d\u8bb0\u5f55\u53d8\u91cfi\u548czval\u6307\u9488\u7684\u6620\u5c04\u5173\u7cfb\r\n$j = $i;   \/\/\u6ca1\u6709\u5728\u7533\u8bf7\u5185\u5b58\u7a7a\u95f4\uff0c\u5728zval\u7684\u6210\u5458\u4e2d\u5f15\u7528\u8ba1\u6570\u6807\u8bb0\u4e3a2\r\n$j = 5;   \/\/\u5185\u6838\u91cd\u65b0\u521b\u5efazval\u6307\u9488\uff0c\u91cd\u590d\u4e0b\u4e0a\u9762\u7684\u6b65\u9aa4\uff0c\u6211\u5c31\u4e0d\u91cd\u590d\u8bf4\u660e\u4e86\uff0c\u91cd\u70b9\u662f\u5c06\u65e7\u7684zval\u5f15\u7528\u8ba1\u6570\u6807\u8bb0\u4e3a1\r\n\r\n<\/pre>\n<div>\n<div><strong>\u5728\u590d\u5236\u4e00\u4e2a\u5bf9\u8c61\u7684\u65f6\u5019\u5e76\u4e0d\u662f\u771f\u6b63\u7684\u628a\u539f\u5148\u7684\u5bf9\u8c61\u590d\u5236\u5230\u5185\u5b58\u7684\u53e6\u5916\u4e00\u4e2a\u4f4d\u7f6e<\/strong>\u4e0a\uff0c<strong>\u800c\u662f\u5728\u65b0\u5bf9\u8c61\u7684\u5185\u5b58\u6620\u5c04\u8868\u4e2d\u8bbe\u7f6e\u4e00\u4e2a\u6307\u9488<\/strong>\uff0c\u6307\u5411\u6e90\u5bf9\u8c61\u7684\u4f4d\u7f6e\uff0c\u5e76\u628a\u90a3\u5757\u5185\u5b58\u7684<strong>Copy-On-Write<\/strong>\u4f4d\u8bbe\u7f6e\u4e3a1.\u8fd9\u6837\uff0c\u5728\u5bf9\u65b0\u7684\u5bf9\u8c61\u6267\u884c\u8bfb\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u5185\u5b58\u6570\u636e\u4e0d\u53d1\u751f\u4efb\u4f55\u53d8\u52a8\uff0c\u76f4\u63a5\u6267\u884c\u8bfb\u64cd\u4f5c\uff1b\u800c\u5728<strong>\u5bf9\u65b0\u7684\u5bf9\u8c61\u6267\u884c\u5199\u64cd\u4f5c\u65f6\uff0c\u5c06\u771f\u6b63\u7684\u5bf9\u8c61\u590d\u5236\u5230\u65b0\u7684\u5185\u5b58\u5730\u5740\u4e2d\uff0c\u5e76\u4fee\u6539\u65b0\u5bf9\u8c61\u7684\u5185\u5b58\u6620\u5c04\u8868\u6307\u5411\u8fd9\u4e2a\u65b0\u7684\u4f4d\u7f6e\uff0c\u5e76\u5728\u65b0\u7684\u5185\u5b58\u4f4d\u7f6e\u4e0a\u6267\u884c\u5199\u64cd\u4f5c<\/strong>\u3002<\/div>\n<div>\u8fd9\u4e2a\u6280\u672f\u9700\u8981\u8ddf\u865a\u62df\u5185\u5b58\u548c\u5206\u9875\u540c\u65f6\u4f7f\u7528\uff0c\u597d\u5904\u5c31\u662f\u5728\u6267\u884c\u590d\u5236\u64cd\u4f5c\u65f6\u56e0\u4e3a\u4e0d\u662f\u771f\u6b63\u7684\u5185\u5b58\u590d\u5236\uff0c\u800c\u53ea\u662f\u5efa\u7acb\u4e86\u4e00\u4e2a\u6307\u9488\uff0c\u56e0\u800c\u5927\u5927\u63d0\u9ad8\u6548\u7387\u3002\u4f46\u8fd9\u4e0d\u662f\u4e00\u76f4\u6210\u7acb\u7684\uff0c\u5982\u679c\u5728\u590d\u5236\u65b0\u5bf9\u8c61\u4e4b\u540e\uff0c\u5927\u90e8\u5206\u5bf9\u8c61\u90fd\u8fd8\u9700\u8981\u7ee7\u7eed\u8fdb\u884c\u5199\u64cd\u4f5c\u4f1a\u4ea7\u751f\u5927\u91cf\u7684\u5206\u9875\u9519\u8bef\uff0c\u5f97\u4e0d\u507f\u5931\u3002\u6240\u4ee5COW\u9ad8\u6548\u7684\u60c5\u51b5\u53ea\u662f\u5728\u590d\u5236\u65b0\u5bf9\u8c61\u4e4b\u540e\uff0c\u5728\u4e00\u5c0f\u90e8\u5206\u7684\u5185\u5b58\u5206\u9875\u4e0a\u8fdb\u884c\u5199\u64cd\u4f5c\u3002<\/div>\n<\/div>\n<pre>\r\nPHP\u4e2d\u6570\u7ec4\u548c\u5bf9\u8c61\u90fd\u4e3a\u5730\u5740\u4f20\u53c2\uff0c\u5bf9\u8c61\u662f\u53ef\u4ee5\u6b63\u5e38\u7406\u89e3\u7684\uff0c\u4f46\u662f\u6570\u7ec4\u8ddf\u7406\u89e3\u7684\u6709\u4e9b\u5dee\u5f02\u3002<\/pre>\n<div>\n<div>\u6570\u7ec4\u662f\u901a\u8fc7\u5f15\u7528\u4f20\u9012\u7684\uff0c\u9664\u975e\u5b83\u5728\u4f60\u8c03\u7528\u7684\u65b9\u6cd5\/\u51fd\u6570\u4e2d\u88ab\u4fee\u6539\u3002\u5982\u679c<strong>\u60a8\u5c1d\u8bd5\u5728\u65b9\u6cd5\/\u51fd\u6570\u4e2d\u4fee\u6539\u6570\u7ec4\uff0c\u5219\u9996\u5148\u521b\u5efa\u5b83\u7684\u526f\u672c\uff0c\u7136\u540e\u4ec5\u4fee\u6539\u526f\u672c<\/strong>\u3002\u8fd9\u4f7f\u5f97\u5b83\u770b\u8d77\u6765\u597d\u50cf\u6570\u7ec4\u662f\u6309\u503c\u4f20\u9012\u7684\uff0c\u800c\u4e8b\u5b9e\u4e0a\u5e76\u975e\u5982\u6b64\u3002<strong>\u8fd9\u88ab\u79f0\u4e3a\u201c\u61d2\u60f0\u526f\u672c\u201d\u6216\u201c\u5199\u5165\u65f6\u590d\u5236\u201d\u3002<\/strong><\/div>\n<div>\u53c2\u8003\uff1a<\/div>\n<div><a href=\"https:\/\/cloud.tencent.com\/developer\/ask\/216274\">https:\/\/cloud.tencent.com\/developer\/ask\/216274<\/a><\/div>\n<div><a href=\"http:\/\/www.libenfu.com\/index.php\/archives\/544\/\">http:\/\/www.libenfu.com\/index.php\/archives\/544\/<\/a><\/div>\n<div><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5c31\u662f\u5728\u5199\u5165\u65f6\u624d\u771f\u6b63\u590d\u5236\u4e00\u4efd\u5185\u5b58\u8fdb\u884c\u4fee\u6539\uff0c\u4e3e\u4f8b\uff1a $i = 4; \/\/\u5185\u6838\u521b\u5efa\u4e00\u4e2azval\u6307\u9488\uff0c\u5e76\u4e14\u4e3a\u5176\u4ee5\u5806\u7684\u65b9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=\/wp\/v2\/posts\/433"}],"collection":[{"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=433"}],"version-history":[{"count":3,"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=\/wp\/v2\/posts\/433\/revisions"}],"predecessor-version":[{"id":436,"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=\/wp\/v2\/posts\/433\/revisions\/436"}],"wp:attachment":[{"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=433"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=433"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/china-abc.leohe.net.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=433"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}