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PHP random string generator
...
To answer this question specifically, two problems:
$randstring is not in scope when you echo it.
The characters are not getting concatenated together in the loop.
Here's a code snippet with the corrections:
function generateRandomString($length = 10...
Dynamic constant assignment
...how), the actual string object itself is different each time the method is called. For example:
def foo
p "bar".object_id
end
foo #=> 15779172
foo #=> 15779112
Perhaps if you explained your use case—why you want to change the value of a constant in a method—we could help you with a b...
Does the ternary operator exist in R?
...(xs[[1]] == as.name("<-")) {
xs[[3]] <- r
eval.parent(as.call(xs))
} else {
r
}
}
You can get rid of brackets:
> y <- 1 ? 2*3 : 4
> y
[1] 6
> y <- 0 ? 2*3 : 4
> y
[1] 4
> 1 ? 2*3 : 4
[1] 6
> 0 ? 2*3 : 4
[1] 4
These are not for daily use, ...
std::next_permutation Implementation Explanation
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Thanks for explanation! This algorithm is called Generation in lexicographic order. There are numbers of such algorithm in Combinatorics, but this is the most classical one.
– chain ro
Mar 10 '15 at 2:59
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Why does this Java program terminate despite that apparently it shouldn't (and didn't)?
...pen to this memory in the main thread and the reads in the created thread (call it T).
Main thread is doing the following writes (ignoring the initial setup of point, will result in p.x and p.y having default values):
to p.x
to p.y
to currentpos
Because there is nothing special about these wri...
What's the need of array with zero elements?
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This is a way to have variable sizes of data, without having to call malloc (kmalloc in this case) twice. You would use it like this:
struct bts_action *var = kmalloc(sizeof(*var) + extra, GFP_KERNEL);
This used to be not standard and was considered a hack (as Aniket said), but it was ...
Can TCP and UDP sockets use the same port?
...tocols already do this, for example DNS works on udp/53 and tcp/53.
Technically the port pools for each protocol are completely independent, but for higher level protocols that can use either TCP or UDP it's convention that they default to the same port number.
When writing your server, bear in mi...
how to unit test file upload in django
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Henning is technically correct -- this would be more of an integration test -- doesn't actually matter until you get into more complex code bases maybe even with an actual test team
– Alvin
May 2 '17 at ...
warning: refname 'HEAD' is ambiguous
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The problem is that you have a branch called HEAD which is absolutely dangerous, since that's the symbolic name for whatever branch is the current branch.
Rename it:
git branch -m HEAD newbranch
then you can examine it and decide what to do (delete it, or sav...
How to create JSON string in JavaScript?
...ou can use ` (back-tick character. to the left of the #1 key). These are called 'template literals'.
– Blue
Aug 16 '16 at 15:08
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