nginx

Nginx 504报错，PHP-FPM无响应的问题

问题

测试环境，压测接口中间件时遇到报错Nginx 504，查询nginx日志

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2017/11/21 15:20:15 [error] 26954#0: *1835 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.46, server: 192.168.23.95, request: "POST /screenInterface/FunctionByTime.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.23.95:6010", referrer: "http://192.168.23.95:6010/screen2/"
2017/11/21 15:20:15 [error] 26954#0: *1821 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.46, server: 192.168.23.95, request: "POST /screenInterface/FUnctionByMobile.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.23.95:6010", referrer: "http://192.168.23.95:6010/screen2/"
2017/11/21 15:20:15 [error] 26954#0: *1836 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.46, server: 192.168.23.95, request: "POST /screenInterface/LeftGraph.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.23.95:6010", referrer: "http://192.168.23.95:6010/screen2/"

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html+css

前端集锦

<a>标签的download属性

a标签通过添加download属性并把图片的base64赋值给href就可以直接下载图片了。
如果base64长度太大,达到了a标签的href上限，浏览器报网络失败错误，解决方案是将base64 dataURI转换为Blob文件对象。

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php

PHP敏感词过滤DFA算法实现

使用PHP借助DFA算法实现敏感词过滤功能，参照了zenghansen的代码，其中修改了原类的BUG，并增加了查找方法，并对王*八&&蛋这样的，中间填充了无意义的字符来混淆的词的增强匹配处理。
DFA敏感词过滤的原理就是将所有的敏感词载中内存，构建一个个树结构，然后将待匹配的字符串截断成数组，匹配每个数组元素与构建的敏感字典树的节点，匹配得到终节点就说明匹配成功。

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php

php执行普通shell命令

php执行shell命令，可以使用下面几个函数：
string system ( string $command [, int &$return_var ] )
string exec ( string $command [, array &$output [, int &$return_var ]] )
void passthru ( string $command [, int &$return_var ] )

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