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PHP简易排队限流实现

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$fp = fopen(sprintf("tmp/wk_exam_examination.%d.lock", $userid % 10), "w");
if (!flock($fp, LOCK_EX | LOCK_NB)) {
    ?>
  <style>
    #info {
      text-align: center;
      margin: 50px 0;
    }

    #info td {
      font-size: 36px;
      color: seagreen;
    }
  </style>
  <div id='info'></div>
  <script>
    let sec = 5000
    setTimeout(function () {
      window.location.reload()
    }, sec)
    setInterval(function () {
      sec -= 100
      if (sec >= 0) {
        let ok = sec / 1000
        document.getElementById('info').innerHTML = `<table style="margin: 0 auto;">
        <tr><td style='width: 50%; text-align: right;'>页面排队中...</td>
        <td style="width: 2em; text-align: center;">${ok}</td><td>秒后将重试！</td></tr></table>`;
      }
    }, 100)
  </script><?php
    die;
}

solr去重

配置文件：solrconfig.xml

<requestHandler name="/update" class="solr.UpdateRequestHandler" >
  <lst name="defaults">
    <str name="update.chain">dedupe</str>
  </lst>
</requestHandler>

<updateRequestProcessorChain name="dedupe">
  <processor class="solr.processor.SignatureUpdateProcessorFactory">
    <bool name="enabled">true</bool>
    <str name="signatureField">id</str>
    <bool name="overwriteDupes">true</bool>
    <str name="fields">object_id,object_type</str>
    <str name="signatureClass">solr.processor.Lookup3Signature</str>
  </processor>
  <processor class="solr.LogUpdateProcessorFactory" />
  <processor class="solr.RunUpdateProcessorFactory" />
</updateRequestProcessorChain>

修改fields字段为需要去重的字段

Arm64 Centos docker 启动 solr 问题解决方法 

 docker container run -itd --name solr -e SOLR_JAVA_STACK_SIZE=-Xss1m solr -m 2g

指定SOLR_JAVA_STACK_SIZE即可

Starting Solr
Java 17 detected. Enabled workaround for SOLR-16463
[0.001s][warning][pagesize] UseLargePages disabled, no large pages configured and available on the system.

The Java thread stack size specified is too small. Specify at least 448k
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

CSS实现表格对角线 

        td {
            background-size: 100% 100%;
            background-image: url("data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPg0KICA8bGluZSB4MT0iMCIgeTE9IjAiIHgyPSIxMDAlIiB5Mj0iMTAwJSIgc3Ryb2tlPSJibGFjayIgLz4NCjwvc3ZnPg==");
        }

net.ipv4.tcp_tw_reuse = 2 啥意思？ 

index 924bd51327b7..6841c74eac00 100644
--- a/[Documentation/networking/ip-sysctl.txt](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/networking/ip-sysctl.txt?id=39dbc646fd2c67ee9b71450ce172cbd714d4e7fb)
+++ b/[Documentation/networking/ip-sysctl.txt](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/networking/ip-sysctl.txt?id=79e9fed460385a3d8ba0b5782e9e74405cb199b1)
@@ -667,11 +667,15 @@ tcp_tso_win_divisor - INTEGER
building larger TSO frames.
Default: 3
-tcp_tw_reuse - BOOLEAN
- Allow to reuse TIME-WAIT sockets for new connections when it is
- safe from protocol viewpoint. Default value is 0.
+tcp_tw_reuse - INTEGER
+ Enable reuse of TIME-WAIT sockets for new connections when it is
+ safe from protocol viewpoint.
+ 0 - disable
+ 1 - global enable
+ 2 - enable for loopback traffic only
It should not be changed without advice/request of technical
experts.
+ Default: 2```

Much appreciated!

PHP生成器递归遍历目录 

    private function fullScanDir($dir): \Generator
    {
        $list = scandir($dir);
        foreach ($list as $filename) {
            if ($filename === '.' || $filename === '..') continue;
            if ($filename === '.git') continue;
            $aDir = sprintf("%s/%s", $dir, $filename);
            if (is_dir($aDir)) {
                foreach ($this->fullScanDir($aDir) as $_filename) {
                    yield $_filename;
                }
            } else {
                yield $aDir;
            }
        }
    }

iso-8859-1（Latin-1）

因为ISO-8859-1编码范围使用了单字节内的所有空间，在支持ISO-8859-1的系统中传输和存储其他任何编码的字节流都不会被抛弃。换言之，把其他任何编码的字节流当作ISO-8859-1编码看待都没有问题。