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What's the difference between echo, print, and print_r in PHP?
...play strings. The differences are subtle: print has a return value of 1 so it can be used in expressions whereas echo has a void return type; echo can take multiple parameters, although such usage is rare; echo is slightly faster than print. (Personally, I always use echo, never print.)
var_dump pr...
Are inline virtual functions really a non-sense?
... actual object
rather than a pointer or reference to
an object. I.e., either with a local
object, a global/static object, or a
fully contained object inside a
composite."
share
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What is the Ruby (spaceship) operator?
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Perl was likely the first language to use it. Groovy is another language that supports it. Basically instead of returning 1 (true) or 0 (false) depending on whether the arguments are equal or unequal, the spaceship operator will return 1, 0, or −1 depending on the ...
How to loop through array in jQuery?
...ptions much more thoroughly. The third option below, jQuery.each, isn't in it though.)
Four options:
Generic loop:
var i;
for (i = 0; i < substr.length; ++i) {
// do something with `substr[i]`
}
or in ES2015+:
for (let i = 0; i < substr.length; ++i) {
// do something with `subs...
browser sessionStorage. share between tabs?
I have some values in my site which I want to clear when the browser is closed. I chose sessionStorage to store those values. When tab is closed they are indeed cleared, and kept if the user presses f5; But if the user opens some link in a different tab these values are unavailable.
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No module named _sqlite3
... run a Django app on my VPS running Debian 5. When I run a demo app, it comes back with this error:
21 Answers
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String Resource new line /n not possible?
It doesn't seem like it's possible to add a new line /n to an XML resource string. Is there another way of doing this?
10...
What is a serialVersionUID and why should I use it?
...od an explanation as you'll get:
The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatib...
View the change history of a file using Git versioning
How can I view the change history of an individual file in Git, complete details with what has changed?
24 Answers
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What is the HEAD in git?
There seems to be a difference between the last commit, the HEAD and the state of the file I can see in my directory.
5 Ans...