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Best way to test for a variable's existence in PHP; isset() is clearly broken
...ng them as though they were. However, since they can be iterated, counted, etc, a missing value is not the same as one whose value is null.
The answer in this case, is to use array_key_exists() instead of isset().
Since this is takes the array to check as a function argument, PHP will still raise ...
Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?
...s to strings and number values, using == or != or <, > >=, <=, etc.
You can assign an integer to a variable and then get true or false based on that variable value.
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Showing the stack trace from a running Python application
... to continue running (though note that you will probably interrupt any I/O etc at the point you signal, so it isn't fully non-intrusive.
I've another script that does the same thing, except it communicates with the running process through a pipe (to allow for debugging backgrounded processes etc). ...
Get names of all keys in the collection
...s exactly what the question asks, and can be configured with limits, depth etc. Recommended by any who follows.
– Paul Biggar
Jun 10 '12 at 20:35
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Cannot download Docker images behind a proxy
...
First, create a systemd drop-in directory for the Docker service:
mkdir /etc/systemd/system/docker.service.d
Now create a file called /etc/systemd/system/docker.service.d/http-proxy.conf that adds the HTTP_PROXY environment variable:
[Service]
Environment="HTTP_PROXY=http://proxy.example.com:80...
VM 磁盘空间扩容引起的一些问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
VM 磁盘空间扩容引起的一些问题TOP如下存储分区如下ESX1下挂载情况如下图ESX2下挂载情况如下图现在有个需求，lun60的空间偏大，缩小为1T，LUN80的空间偏小，扩大为1.5T先...TOP 如下
存储分区如下
ESX1下挂载情况如下图
...
强烈推荐一款非常mini的代码高亮开源软件--prism - 开源 & Github - 清泛网...
强烈推荐一款非常mini的代码高亮开源软件--prism从网络上搜索开源的代码高亮软件，不下20款，但是我们怎么从中选择一款最适合自己的呢？往往我们比较看重的是其美观度、源码精简度、源码修改难度、代码复制纯度等等。目...
阿里巴巴：大数据基础建议及产品应用 - 资讯 - 清泛网 - 专注C/C++及内核技术
...和存储管控等
角色：云梯研发、运维等
“大数据”的挑战，一个闭环的挑战
数据采集：数据量大且结构多样；离线采集和在线采集技术实现
数据计算：数据质量和效率；开发、计算和存储资源；离线计算和在线计算成...
oracle:完整剖析PL/SQL DEVELOPER与SQL PLUS字符集设置 - 数据库(内核) - ...
...文重点剖析PL SQL DEVELOPER与SQL PLUS字符集设置问题，对两者的中文数据写入、读取之间整个流程做描述，抛砖引玉。工作后要保持...提要：本文重点剖析PL/SQL DEVELOPER与SQL PLUS字符集设置问题，对两者的中文数据写入、读取之间整个...
PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
PHP操作MongoDB时的整数问题及对策本文所说的整数问题，其实并不是MongoDB的问题，而是PHP驱动的问题：MongoDB本身有两种整数类型，分别是：32位整数和64位整数，但旧版的PHP...本文所说的整数问题，其实并不是MongoDB的问题，而是P...