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What does new self(); mean in PHP?
... PHP < 5.3, that "the class in which it is written" is important -- and can sometimes cause problems.
That's why PHP 5.3 introduces a new usage for the static keyword : it can now be used exactly where we used self in those examples :
class MyParentClass {
public static function getInstance...
ruby on rails f.select options with custom attributes
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Rails CAN add custom attributes to select options, using the existing options_for_select helper. You almost had it right in the code in your question. Using html5 data-attributes:
<%= f.select :country_id, options_for_select(
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android button selector
...umpad_button_bg_normal"></item>
</selector>
In this, you can see that there are 3 drawables, you just need to place this button_effect style to your button, as i wrote above. You just need to replace selector_xml_name with button_effect.
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Types in MySQL: BigInt(20) vs Int(20)
...it would seem obvious that they would allow for larger numbers; however, I can make an Int(20) or a BigInt(20) and that would make seem that it is not necessarily about size.
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What is a MIME type?
...ME type is a label used to identify a type of data. It is used so software can know how to handle the data. It serves the same purpose on the Internet that file extensions do on Microsoft Windows.
So if a server says "This is text/html" the client can go "Ah, this is an HTML document, I can render ...
Change the name of the :id parameter in Routing resources for Rails
...m option was added, which seems to do exactly what you're looking for. You can take a look at the Rails 3 code compared to the Rails 4 code.
Details
You can easily implement this in your routes.rb file:
# config/routes.rb
resources :posts, param: :slug
# app/controllers/posts_controller.rb
# ....
Why do we need message brokers like RabbitMQ over a database like PostgreSQL?
I am new to message brokers like RabbitMQ which we can use to create tasks / message queues for a scheduling system like Celery .
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When should I use std::thread::detach?
Sometime I have to use std::thread to speed up my application. I also know join() waits until a thread completes. This is easy to understand, but what's the difference between calling detach() and not calling it?
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Possible heap pollution via varargs parameter
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Heap pollution is a technical term. It refers to references which have a type that is not a supertype of the object they point to.
List<A> listOfAs = new ArrayList<>();
List<B> listOfBs = (List<B>)(Object)listOfAs; // points t...
Argparse: Required arguments listed under “optional arguments”?
...without providing the argument, the displayed usage/help text does not indicate that there is a non-optional argument, which I find very confusing. How can I get python to indicate that an argument is not optional?
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