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Better way to check variable for null or empty string?
Since PHP is a dynamic language what's the best way of checking to see if a provided field is empty?
10 Answers
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Get a random item from a JavaScript array [duplicate]
...tion if you want: npmjs.com/package/lodash.sample
– XåpplI'-I0llwlg'I -
Dec 4 '15 at 11:32
4
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How can I pipe stderr, and not stdout?
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@JonasDahlbæk: the tweak is primarily an issue of tidiness. In truly arcane situations, it might make the difference between a process detecting and not detecting EOF, but that requires very peculiar circumstances.
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How can I copy the content of a branch to a new local branch?
I have worked on a local branch and also pushed the changes to remote. I want to revert the changes on that branch and do something else on it, but I don't want to lose the work completely. I was thinking of something like create a new branch locally and copy the old branch there, then I can revert ...
How to format numbers as currency string?
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@JuliendePrabère Please give an example of a long number which doesn't work with this approach.
– VisioN
Mar 25 '14 at 10:53
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Popup弹出菜单扩展 · App Inventor 2 中文网
...中使用MenuItemsFromFile属性，在运行时使用LoadMenuItemsFromFile函数。
菜单项定义格式
菜单行的定义最多包含三个部分，用双冒号(::)分隔：
[::[][::T | F]]
这意味着：强制性的超文本格式标题（菜单栏中显示的文本...
AI2 Keep Awake
... standby mode. 1) Android hat seine Powermanagement-Policy mehrmals geändert. Außerdem implementieren die verschiedenen Gerätehersteller diese Funktionen z.T. unterschiedlich. Man sollte also unbedingt testen, ob die hier gemachten Angaben für das eigene Projekt zutreffen. Das oben beschr...
How to create a drop-down list?
...presso</item>
<item>Mocha</item>
<item>Caffè Americano</item>
<item>Cafe Zorro</item>
</string-array>
MainActivity
Spinner staticSpinner = (Spinner) findViewById(R.id.static_spinner);
// Create an ArrayAdapter using the string a...
How to compare two revisions in Bitbucket?
...id with the current version of Bitbucket?
– Martin Stålberg
Oct 31 '17 at 10:03
I just tried this with two commits fr...
关于php的socket初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...该模式的一个实现，socket即是一种特殊的文件，一些socket函数就是对其进行的操作（读/写IO、打开、关闭）
既然Unix/Linux是将socket以一种io的形式来编程实现，那对于socket的研究必然有几个概念要理解：
1、阻塞/非阻塞：这两个...