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“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
... can be used to detect if a variable has been already initialized. Additionally and more ideal is the solution of empty() since it does not generate a warning or error message if the variable is not initialized.
From PHP documentation:
No warning is generated if the variable does not exist. T...
Checking a Python module version at runtime
...s have an attribute which holds the version information for the module (usually something like module.VERSION or module.__version__ ), however some do not.
...
Is there a way to cause git-reflog to show a date alongside each entry?
...he documentation about date with git reflog.
See commit 642833d, commit 1a2a1e8 (27 Jul 2016), and commit d38c7b2, commit 522259d, commit 83c9f95, commit 2b68222 (22 Jul 2016) by Jeff King (peff).
Helped-by: Jeff King (peff).
(Merged by Junio C Hamano -- gitster -- in commit 0d32799, 08 Aug 2016) ...
How to use permission_required decorators on django class-based views
...ing how the new CBVs work. My question is this, I need to require login in all the views, and in some of them, specific permissions. In function-based views I do that with @permission_required() and the login_required attribute in the view, but I don't know how to do this on the new views. Is there ...
Why is lock(this) {…} bad?
...
It is bad form to use this in lock statements because it is generally out of your control who else might be locking on that object.
In order to properly plan parallel operations, special care should be taken to consider possible deadlock situations, and having an unknown number of lock en...
How can you use optional parameters in C#?
...
Good on you for providing up-to-date information. Ideally the original answers would be updated with current information such as C# 4.0. I believe that is what the SO guys originally had in mind, a Wiki mentality, but everyone is a bit too afraid to edit someone else's answer.
...
Is there a simple way to convert C++ enum to string?
... +1, GCCXML looks very nice! (Although I almost -1ed as I initially misread this as a suggestion to use the above verbose XML syntax to encode your enum -- a solution which reeks of overengineering!)
– j_random_hacker
Mar 12 '09 at 9:46
...
Should I use alias or alias_method?
...dict: Use alias_method - it gives you a ton more flexibility.
Usage:
def foo
"foo"
end
alias_method :baz, :foo
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基于PECL OAuth打造微博应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...令来检测这种现象，大致方法如下：
shell> tcpdump -A host foo.com
此时，某些防火墙会过滤掉非标准HTTP1.0的请求头，如Host请求头，从而造成错误。
详见：由于 HTTP request 不规范导致的被防火墙拦截。
新类MicroblogOAuth直接扩展自PE...
How do you convert a DataTable into a generic list?
...e DataTableExtensions.AsEnumerable (an extension method) and then if you really need a List<DataRow> instead of just IEnumerable<DataRow> you can call Enumerable.ToList:
IEnumerable<DataRow> sequence = dt.AsEnumerable();
or
using System.Linq;
...
List<DataRow> list = dt.A...