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How to encrypt/decrypt data in php?
...d
}
// constant time string compare
function isEqual($str1, $str2)
{
$n1 = strlen($str1);
if (strlen($str2) != $n1) {
return false;
}
for ($i = 0, $diff = 0; $i != $n1; ++$i) {
$diff |= ord($str1[$i]) ^ ord($str2[$i]);
}
return !$diff;
}
To verify a passwor...
Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...广州的时候，Ray让我和春哥对Line和WhatsApp的心跳机制进行分析。我和春哥抓包测试了差不多两个多礼拜，在我们基本上摸清了Line和WhatsApp的心跳机制后，Ray才告诉我们真正的任务——对微信的固定心跳进行优化，并告诉我们这不...
How can I get Docker Linux container information from within the container itself?
...ad to use: cat /proc/self/cgroup | grep 'docker' | sed 's/^.*\///' | tail -n1
– Jay Taylor
Jul 24 '15 at 19:30
14
...
Logic to test that 3 of 4 are True
...uage, my suggestion is
bool test(bool a, bool b, bool c, bool d){
int n1 = a ? 1 : 0;
int n2 = b ? 1 : 0;
int n3 = c ? 1 : 0;
int n4 = d ? 1 : 0;
return n1 + n2 + n3 + n4 == 3;
}
Or if you want, you can put all of these in a single line:
return (a ? 1 : 0) + (b ? 1 : 0) + (C...
灾难恢复RTO 与 RPO - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...楚一个基本概念，企业的容灾系统预防的是什么灾害，是多少年一遇的，能忍受多少损失，需要算出一个大概的成本，当然不一定很精确。
其次，无论企业容灾系统是采用冷备、热备、温备、还是磁盘备份，几分钟恢复业务和...
PHP优化杂烩 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...态之分。动态模式一般先启动少量进程，再按照请求数的多少实时调整进程数。如此的优点很明显：节省资源；当然它的缺点也很明显：一旦出现高并发请求，系统将不得不忙着 FORK 新进程，必然会影响性能。相对应的，静态模...
Shell - How to find directory of some command?
...n case of nvm which is a bash function I needed to do: type -a nvm | head -n1 to find out what exactly is nvm.
– Marinos An
Oct 2 '19 at 12:28
...
How to recursively find the latest modified file in a directory?
...:
find . -type f -printf '%TY-%Tm-%Td %TH:%TM: %Tz %p\n'| sort -n | tail -n1
Result looks like this:
2015-10-06 11:30: +0200 ./foo/bar.txt
To show more files, replace -n1 with a higher number
share
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Bash tool to get nth line from a file
...
I think tail -n+NUM file | head -n1 is likely to be just as fast or faster. At least, it was (significantly) faster on my system when I tried it with NUM being 250000 on a file with half a million lines. YMMV, but I don't really see why it would.
...
初创公司如何利用社交媒体实现营销效果最大化？ - 资讯 - 清泛网 - 专注C/C...
...估一下自己的能力，不妨来看看下面这几类：
l 每周有多少时间可以花在社交媒体管理上：时间非常重要，因此你需要了解自己应该优先处理哪些社交媒体，有多少渠道要去管理。高效的社交媒体管理意味着重要的工作必须优...