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Calculate number of hours between 2 dates in PHP
...at it considers different timezones, leap years, leap seconds, summertime, etc. And on top of that it's very easy to use. Here's what you want with the help of this objects:
// Create two new DateTime-objects...
$date1 = new DateTime('2006-04-12T12:30:00');
$date2 = new DateTime('2006-04-14T11:30:0...
Tell Ruby Program to Wait some amount of time
...ax:
sleep(4.minutes)
# or, even longer...
sleep(2.hours); sleep(3.days) # etc., etc.
# or shorter
sleep(0.5) # half a second
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What is Prism for WPF?
...ia Unity or MEF), layout (including using MVVM), composite event handling, etc.
Is Prism literally just (or mainly) a booklet, as given on the MSDN site? Does it include any libraries, if so for what exactly?
It is a book, but also includes the libraries for support (on the GitHub site).
...
Const in JavaScript: when to use it and is it necessary?
...ehaviour is only applicable to Strings, Basic Types. Using Objects, Arrays etc. it is possible to change the values but it is not possible to re-assign an new "Object", e.g. const a = ["a","b"]; a = []; will throw an error otherwise it is possible
– Fer To
Feb ...
How can I count text lines inside an DOM element? Can I?
...:
var element = document.getElementById('content');
document.defaultView.getComputedStyle(element, null).getPropertyValue("lineHeight");
You will also need to take padding and inter-line spacing into account.
EDIT
Fully self-contained test, explicitly setting line-height:
function countLin...
MySQL - why not index every field?
...he line, that depends on how the data is being acessed (sorting filtering, etc.).
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What is the runtime performance cost of a Docker container?
... the kernel's support for different process namespaces, device namespaces, etc.; one namespace isn't inherently more expensive or inefficient than another, so what actually makes Docker have a performance impact is a matter of what's actually in those namespaces.
Docker's choices in terms of how ...
Hg: How to do a rebase like git's rebase
...ding use of TortoiseHG to commit some but not all changes in an individual file, like git gui's stage/unstage diff hunk for commit).
The process is to get hg updated to the upstream tip, and then get all your changes uncommitted in the working directory. Shelve any that aren't part of what you wan...
Any way to make a WPF textblock selectable?
... (blinking caret in TextBox, no keyboard support in manual implementations etc.)
After hours of digging around and reading the WPF source code, I instead discovered a way of enabling the native WPF text selection for TextBlock controls (or really any other controls). Most of the functionality aroun...
Explanation of JSONB introduced by PostgreSQL
...f JSON manipulation inside PostgreSQL, such as sorting, slicing, splicing, etc., you should use JSONB for speed reasons.
If you need indexed lookups for arbitrary key searches on JSON, then you should use JSONB.
If you are doing neither of the above, you should probably use JSON.
If you need to pres...