{"id":202413,"date":"2025-05-13T12:22:33","date_gmt":"2025-05-13T04:22:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202413\/"},"modified":"2025-05-13T12:22:33","modified_gmt":"2025-05-13T04:22:33","slug":"php%e5%87%bd%e6%95%b0%e6%96%87%e4%bb%b6%e6%93%8d%e4%bd%9c%e6%8c%87%e5%8d%97%ef%bc%9a%e5%a6%82%e4%bd%95%e8%8e%b7%e5%8f%96%e6%96%87%e4%bb%b6%e7%9a%84%e6%9c%80%e5%90%8e%e4%bf%ae%e6%94%b9%e6%97%b6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202413\/","title":{"rendered":"php\u51fd\u6570\u6587\u4ef6\u64cd\u4f5c\u6307\u5357\uff1a\u5982\u4f55\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

php\u51fd\u6570\u6587\u4ef6\u64cd\u4f5c\u6307\u5357\uff1a\u5982\u4f55\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff1f<\/h1>\n

\u600e\u4e48\u5165\u95e8\u6587\u7ae0\u7f16\u7a0b\uff1f\u9700\u8981\u5b66\u4e60\u54ea\u4e9b\u77e5\u8bc6\u70b9\uff1f\u8fd9\u662f\u65b0\u624b\u4eec\u521a\u63a5\u89e6\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\uff1b\u4e0b\u9762\u5c31\u6765\u7ed9\u5927\u5bb6\u6574\u7406\u5206\u4eab\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u591f\u7ed9\u521d\u5b66\u8005\u4e00\u4e9b\u5e2e\u52a9\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u4ecb\u7ecd\u300aphp\u51fd\u6570\u6587\u4ef6\u64cd\u4f5c\u6307\u5357\uff1a\u5982\u4f55\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff1f\u300b\uff0c\u6d89\u53ca\u5230\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u6536\u85cf\u4e00\u4e0b<\/p>\n

\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\u7684\u65b9\u6cd5\u6709\u4e09\u79cd\uff1a\u4f7f\u7528 filemtime() \u51fd\u6570\u8fd4\u56de Unix \u65f6\u95f4\u6233\u3001\u4f7f\u7528 stat() \u51fd\u6570\u8fd4\u56de\u5305\u542b\u6700\u540e\u4fee\u6539\u65f6\u95f4\u7684\u4fe1\u606f\u6570\u7ec4\u3001\u4f7f\u7528 DateTime \u5bf9\u8c61\u89e3\u6790\u65f6\u95f4\u6233\u3002<\/p>\n

<\/p>\n

PHP \u51fd\u6570\u6587\u4ef6\u64cd\u4f5c\u6307\u5357\uff1a\u5982\u4f55\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4<\/strong><\/p>\n

\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\u5bf9\u4e8e\u8ddf\u8e2a\u6587\u4ef6\u66f4\u65b0\u6216\u786e\u5b9a\u6587\u4ef6\u4f55\u65f6\u9700\u8981\u91cd\u65b0\u52a0\u8f7d\u975e\u5e38\u6709\u7528\u3002\u5728 PHP \u4e2d\uff0c\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\u3002<\/p>\n

\u4f7f\u7528 filemtime() \u51fd\u6570<\/strong><\/p>\n

filemtime()<\/code> \u51fd\u6570\u662f\u6700\u7b80\u5355\u7684\u65b9\u6cd5\uff0c\u5b83\u5c06\u8fd4\u56de\u7ed9\u5b9a\u6587\u4ef6\u81ea 1970 \u5e74 1 \u6708 1 \u65e5\u4ee5\u6765\u7684 Unix \u65f6\u95f4\u6233\u3002<\/p>\n

$timestamp = filemtime('file.txt');<\/pre>\n
\u4f7f\u7528 stat() \u51fd\u6570<\/strong><\/p>\n
stat()<\/code> \u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u6709\u5173\u6587\u4ef6\u7684\u4fe1\u606f\uff0c\u5305\u62ec\u6700\u540e\u4fee\u6539\u65f6\u95f4\u3002<\/p>\n
$result = stat('file.txt');\n$timestamp = $result['mtime'];<\/pre>\n
\u4f7f\u7528 DateTime \u5bf9\u8c61<\/strong><\/p>\n
\u60a8\u53ef\u4ee5\u4f7f\u7528 DateTime<\/code> \u5bf9\u8c61\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff0c\u8be5\u5bf9\u8c61\u53ef\u4ee5\u89e3\u6790\u65f6\u95f4\u6233\u3002<\/p>\n
$timestamp = filemtime('file.txt');\n$date = new DateTime();\n$date->setTimestamp($timestamp);\necho $date->format('Y-m-d H:i:s');<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u5047\u8bbe\u60a8\u6709\u4e00\u4e2a\u540d\u4e3a file.txt<\/code> \u7684\u6587\u4ef6\uff0c\u5e76\u4e14\u60a8\u5e0c\u671b\u5728\u6587\u4ef6\u81ea\u4e0a\u6b21\u8bfb\u53d6\u540e\u53d1\u751f\u66f4\u6539\u65f6\u901a\u77e5\u7528\u6237\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528 filemtime()<\/code> \u51fd\u6570\u5b9e\u73b0\u7684\uff1a<\/p>\n
$last_modified = filemtime('file.txt');\n\nif ($last_modified > $_SESSION['last_read']) {\n    \/\/ \u6587\u4ef6\u5df2\u88ab\u4fee\u6539\n    echo '\u6587\u4ef6\u5df2\u66f4\u65b0\uff01';\n    $_SESSION['last_read'] = $last_modified;\n}<\/pre>\n
\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aphp\u51fd\u6570\u6587\u4ef6\u64cd\u4f5c\u6307\u5357\uff1a\u5982\u4f55\u83b7\u53d6\u6587\u4ef6\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u516c\u4f17\u53f7\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
php\u51fd\u6570\u6587\u4ef6\u64cd\u4f5c\u6307\u5357\uff1a\u5982\u4f55\u83b7\u53d6...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202413","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202413"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202413\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}