{"id":1172,"date":"2023-07-04T17:30:14","date_gmt":"2023-07-04T09:30:14","guid":{"rendered":"https:\/\/log.tanxiaodian.com\/?p=1172"},"modified":"2023-07-04T17:30:20","modified_gmt":"2023-07-04T09:30:20","slug":"php%e5%af%b9%e6%96%87%e4%bb%b6%e7%9a%84%e4%b8%80%e4%ba%9b%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/log.tanxiaodian.com\/?p=1172","title":{"rendered":"PHP\u5bf9\u6587\u4ef6\u7684\u4e00\u4e9b\u64cd\u4f5c"},"content":{"rendered":"\n<p><strong>flock<\/strong>(resource\u00a0<code>$stream<\/code>,\u00a0int\u00a0<code>$operation<\/code>,\u00a0int\u00a0<code>&amp;$would_block<\/code>\u00a0=\u00a0<strong><code>null<\/code><\/strong>):\u00a0bool<\/p>\n\n\n\n<p>\u9501\u5b9a\u6587\u4ef6<\/p>\n\n\n\n<p>\/\/\u53c2\u6570\u8bf4\u660e:<\/p>\n\n\n\n<p><code>stream<\/code><\/p>\n\n\n\n<p>\u6587\u4ef6\u7cfb\u7edf\u6307\u9488\uff0c\u662f\u5178\u578b\u5730\u7531&nbsp;<a href=\"https:\/\/www.php.net\/manual\/zh\/function.fopen.php\">fopen()<\/a>&nbsp;\u521b\u5efa\u7684&nbsp;resource(\u8d44\u6e90)\u3002<code>operation<\/code><\/p>\n\n\n\n<p><code>operation<\/code>&nbsp;\u53ef\u4ee5\u662f\u4ee5\u4e0b\u503c\u4e4b\u4e00\uff1a<\/p>\n\n\n\n<ul><li><strong><code>LOCK_SH<\/code><\/strong>\u53d6\u5f97\u5171\u4eab\u9501\u5b9a\uff08\u8bfb\u53d6\u7684\u7a0b\u5e8f\uff09\u3002<\/li><li><strong><code>LOCK_EX<\/code><\/strong>&nbsp;\u53d6\u5f97\u72ec\u5360\u9501\u5b9a\uff08\u5199\u5165\u7684\u7a0b\u5e8f\u3002<\/li><li><strong><code>LOCK_UN<\/code><\/strong>&nbsp;\u91ca\u653e\u9501\u5b9a\uff08\u65e0\u8bba\u5171\u4eab\u6216\u72ec\u5360\uff09\u3002<\/li><\/ul>\n\n\n\n<p><code>would_block<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u9501\u5c06\u5835\u585e\uff08EWOULDBLOCK \u9519\u8bef\u7801\u60c5\u51b5\u4e0b\uff09\uff0c\u7b2c\u4e09\u4e2a\u53ef\u9009\u53c2\u6570\u4f1a\u8bbe\u7f6e\u4e3a 1\u3002<\/p>\n\n\n\n<p>\u5199\u6587\u4ef6\u7684\u4e00\u4e9b\u6d41\u7a0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$fp = fopen(\"\/tmp\/lock.txt\", \"r+\");\r\n\r\nif (flock($fp, LOCK_EX)) {  \/\/ \u8fdb\u884c\u6392\u5b83\u578b\u9501\u5b9a\r\n    ftruncate($fp, 0);      \/\/ truncate file\r\n    fwrite($fp, \"Write something here\\n\");\r\n    fflush($fp);            \/\/ flush output before releasing the lock\r\n    flock($fp, LOCK_UN);    \/\/ \u91ca\u653e\u9501\u5b9a\r\n} else {\r\n    echo \"Couldn't get the lock!\";\r\n}\r\n\r\nfclose($fp);<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">if(!($cachefile &amp;&amp; $fp &amp;&amp; flock($fp, <em>LOCK_EX<\/em>) &amp;&amp; ftruncate($fp, 0) &amp;&amp; fwrite($fp, $template) &amp;&amp; fflush($fp) &amp;&amp; flock($fp, <em>LOCK_UN<\/em>) &amp;&amp; fclose($fp))) {<br>   return $template;<br>}<\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>flock(resource\u00a0$stream,\u00a0i&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/log.tanxiaodian.com\/?p=1172\">Continue reading<span class=\"screen-reader-text\">PHP\u5bf9\u6587\u4ef6\u7684\u4e00\u4e9b\u64cd\u4f5c<\/span><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts\/1172"}],"collection":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1172"}],"version-history":[{"count":1,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts\/1172\/revisions"}],"predecessor-version":[{"id":1173,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=\/wp\/v2\/posts\/1172\/revisions\/1173"}],"wp:attachment":[{"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1172"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1172"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/log.tanxiaodian.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1172"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}