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Two-way encryption: I need to store passwords that can be retrieved
...n specific key can be stored anywhere (in a config file outside of the web-root, in an environmental variable, etc). The user specific one would be stored in a column in the db next to the encrypted password. The user supplied one would not be stored. Then, you'd do something like this:
$key = $...
Creating a Radial Menu in CSS
...t HTML and CSS, no JS, no SVG, no images (other than the background on the root element).
2015 demo
Screenshots
Chrome 43:
Firefox 38:
IE 11:
Code
The HTML is pretty simple. I'm using the checkbox hack to reveal/ hide the menu.
<input type='checkbox' id='t'/>
<label for='t'>...
A semantics for Bash scripts?
...(much of the shell's arithmetic syntax semantics comes from C).
The other root of the shell's syntax comes from its upbringing as a mishmash of individual UNIX utilities. Most of what are often builtins in the shell can actually be implemented as external commands. It throws many shell neophytes fo...
Does PHP have threading?
... folder ([phpDirectory]/ext).
Copy pthreadVC2.dll into [phpDirectory] (the root folder - not the extension folder).
Edit [phpDirectory]/php.ini and insert the following line
extension=php_pthreads.dll
Test it with the script above with some sleep or something right there where the comment is.
An...
What is an intuitive explanation of the Expectation Maximization technique? [closed]
...n.
This is the estimate of the variance, take the positive square
root to find the standard deviation.
"""
variance = np.sum(weight * (data - mean)**2) / np.sum(weight)
return np.sqrt(variance)
# new estimates for standard deviation
blue_std_guess = estimate_std(both_colours, b...
Multiple glibc libraries on a single host
..., not all is lost, but it gets trickier. One solution is to set a proper chroot environment for it. Another possibility is to use rtldi and a binary editor.
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What is an existential type?
...ction height which returns the furthest distance from any leaf node to the root node t.
Now, let's turn the above pseudo-code for height into proper Java syntax! (I'll keep on omitting some boilerplate for brevity's sake, such as object-orientation and accessibility modifiers.) I'm going to show t...
Why is good UI design so hard for some Developers? [closed]
...n science, and some from CS. Most are hybrids, but every hybrid has deeper roots in one or more fields. If this interests you, look around and try to understand the differences between these programs. Some offer online courses and certificate programs in addition to full-fledged degrees.
Why UI de...
Does anyone beside me just NOT get ASP.NET MVC? [closed]
...; tagging in the default views and how "ugly" it is. That opinion is often rooted in being used to the WebForms approach, which just moves most of the classic ASP ugliness into the code-behind file.
Even without doing code-behinds "wrong", you have things like OnItemDataBound in Repeaters, which is...
What is a NullReferenceException, and how do I fix it?
...se at once. Note: It does not matter which data provider you are using -- MySQL, SQL Server, OleDB, etc. -- the concepts are the same.
Example 1
Dim da As OleDbDataAdapter
Dim ds As DataSet
Dim MaxRows As Integer
con.Open()
Dim sql = "SELECT * FROM tblfoobar_List"
da = New OleDbDataAdapter(sql, co...