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What does $$ (dollar dollar or double dollar) mean in PHP?
...ample, if you consider this portion of code :
$real_variable = 'test';
$name = 'real_variable';
echo $$name;
You will get the following output :
test
Here :
$real_variable contains test
$name contains the name of your variable : 'real_variable'
$$name mean "the variable thas has its name co...
The cause of “bad magic number” error when loading a workspace and how to avoid it?
...ead of readRDS() (yes, 9 months later, I'm back here for pretty much the same mistake).
– Waldir Leoncio
Nov 13 '14 at 17:35
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How do I mock the HttpContext in ASP.NET MVC using Moq?
... this requestContext. I am trying to pass this along but I am not doing something right.
5 Answers
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Proper MIME type for OTF fonts
...ching the web, I find heaps of different suggestions for what the proper MIME type for a font is, but I have yet to try any MIME type that rids me of a Chrome warning such as the following:
...
Should I use the Reply-To header when sending emails as a service to others?
...that acts as a middleman, allowing Company A to send reports to their customers.
3 Answers
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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
After conducting some experiments on square matrices of different sizes, a pattern came up. Invariably, transposing a matrix of size 2^n is slower than transposing one of size 2^n+1 . For small values of n , the difference is not major.
...
What is “:-!!” in C code?
...e can be evaluated to be 0, and if not, to fail the build.
The macro is somewhat misnamed; it should be something more like BUILD_BUG_OR_ZERO, rather than ...ON_ZERO. (There have been occasional discussions about whether this is a confusing name.)
You should read the expression like this:
sizeof(...
Does setWidth(int pixels) use dip or px?
...'re wondering how to use dips instead. The answer is in TypedValue.applyDimension(). Here's an example of how to convert dips to px in code:
// Converts 14 dip into its equivalent px
Resources r = getResources();
int px = Math.round(TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 14,r...
What is “loose coupling?” Please provide examples
...al*salesTax;
return cartTotal;
}
}
Notice how the OrderTotal method (and thus the Order class) depends on the implementation details of the CartContents and the CartEntry classes. If we were to try to change this logic to allow for discounts, we'd likely have to change all 3 classes. A...
See what process is using a file in Mac OS X
...en processes in activity monitor but I think it's happening to quickly for me to see it. The reason for this is I'm using a framework and I think the system version of the framework is being used instead of the debug version and I'd like to see which process is touching it.
...