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Why is the standard session lifetime 24 minutes (1440 seconds)?
...nutes, not seconds. And the default lifetime was 1440 minutes, or exactly one day. Here's that line of code from PHPLIB:
var $gc_time = 1440; ## Purge all session data older than 1440 minutes.
Sascha Schumann was involved with the PHPLIB project around the period of 1998 to 2000. There'...
Django: Why do some model fields clash with each other?
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For someone just learning the framework, this would not be obvious.
– jkyle
Feb 23 '11 at 4:48
3
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Click event doesn't work on dynamically generated elements [duplicate]
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This worked for me. Funny none of the answers above point out the fact that a non-dynamic parent selector has to be used. No wonder '.on' was not working for me earlier.
– aces.
Feb 20 '13 at 17:33
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How to concatenate a std::string and an int?
...TLSoft (header-only); most/all platforms
safe-ish (you don't use more than one int_to_string() call in a single statement), fast; requires STLSoft (header-only); Windows-only
is safe, but slow; requires Poco C++ ; most/all platforms
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Compiled vs. Interpreted Languages
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A compiled language is one where the program, once compiled, is expressed in the instructions of the target machine. For example, an addition "+" operation in your source code could be translated directly to the "ADD" instruction in machine code.
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How to avoid using Select in Excel VBA
...times in this post, but who's counting. ☺ ...but seriously, it's an easy one to forget when working with variables holding objects. A variant variable doesn't require Set until you assign an object to it. For example, Dim x: x = 1 is okay, but Dim x: x = Sheets("Sheet1") will generate Error 438. ...
Uncaught Error: SECURITY_ERR: DOM Exception 18 when I try to set a cookie
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I had issues with images and getImageData function.
Finally, I discovered one can launch chrome with the --allow-file-access-from-file command switch, that get rid of this protection security.
The only thing is that it makes your browser less safe, and you can't have one chrome instance with the fl...
How to generate a random number in C++?
...em of your test application is that you call srand once and then call rand one time and exit.
The whole point of srand function is to initialize the sequence of pseudo-random numbers with a random seed.
It means that if you pass the same value to srand in two different applications (with the same sr...
What does the 'static' keyword do in a class?
...rs belong to the class instead of a specific instance.
It means that only one instance of a static field exists[1] even if you create a million instances of the class or you don't create any. It will be shared by all instances.
Since static methods also do not belong to a specific instance, they c...
How do I find Waldo with Mathematica?
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I've found Waldo!
How I've done it
First, I'm filtering out all colours that aren't red
waldo = Import["http://www.findwaldo.com/fankit/graphics/IntlManOfLiterature/Scenes/DepartmentStore.jpg"];
red = Fold[ImageSubtract, #[[1]], Rest[#]] &@ColorSe...