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How to encrypt/decrypt data in php?
...= openssl_random_pseudo_bytes($key_size, $strong);
// $strong will be true if the key is crypto safe
This can be done once or multiple times (if you wish to create a chain of encryption keys). Keep these as private as possible.
IV
The initialisation vector adds randomness to the encryption and r...
When should I use semicolons in SQL Server?
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@maurocam I think you've read the document incorrectly. If you look at that link it says "Not ending Transact-SQL statements with a semicolon." is deprecated.
– Caltor
Nov 6 '17 at 15:10
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Best way to read a large file into a byte array in C#?
... byte arrays. The server could be reading several files at the same time (different page requests), so I am looking for the most optimized way for doing this without taxing the CPU too much. Is the code below good enough?
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Express.js: how to get remote client address
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If you are running behind a proxy like NGiNX or what have you, only then you should check for 'x-forwarded-for':
var ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
If the proxy isn't 'yours', I wouldn...
Change values while iterating
...that range copies the values from the slice you're iterating over.
The specification about range says:
Range expression 1st value 2nd value (if 2nd variable is present)
array or slice a [n]E, *[n]E, or []E index i int a[i] E
So, range us...
How to create a directory using Ansible
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You want the file module. To create a directory, you need to specify the option state=directory :
- name: Creates directory
file:
path: /src/www
state: directory
You can see other options at http://docs.ansible.com/file_module.html
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How to prevent going back to the previous activity?
When the BACK button is pressed on the phone, I want to prevent a specific activity from returning to its previous one.
13 ...
Adding information to an exception?
... %s' % arg1)
IOError: Stuff happens at arg1
Update 1
Here's a slight modification that preserves the original traceback:
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def bar(arg1):
try:
foo()
except Exception as e:
import sys
raise type(e), type(e)(e.message +
' happens at ...
Print array elements on separate lines in Bash?
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Try doing this :
$ printf '%s\n' "${my_array[@]}"
The difference between $@ and $*:
Unquoted, the results are unspecified. In Bash, both expand to separate args
and then wordsplit and globbed.
Quoted, "$@" expands each element as a separate argument, while "$*"
expands to the a...
How to get the name of a function in Go?
..., some care may be required here: the documentation for .Pointer() states "If v's Kind is Func, the returned pointer is an underlying code pointer, but not necessarily enough to identify a single function uniquely. The only guarantee is that the result is zero if and only if v is a nil func Value."
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